Product review (4 stars): A great deal commercial-grade kegerator, but make sure you really are OK with commercial-grade noise
I purchased the 4-faucet model of this about a month ago.  Here are my impressions so far:

First, this "homebrew" package is an absolute steal of a deal, even if you do not plan to use ball-lock style kegs.  When you are looking at commercial kegerators, once you go past single faucet models, pretty much every manufacturer sells them with just the tower, faucets, and beer lines.  No taps, no CO2 bottle, no air lines, no CO2 manifold.  The price of that stuff really adds up, and this kit here gives you a significant discount vs. buying that stuff individually, and none of it is low-end kit.  You're getting a dual gauge regulator, not a single-gauge.  You're getting a metal CO2 manifold/splitter, not a plastic one.  And the red CO2 bottle is so beautiful that I almost want to set it on top of the machine so everyone can look at it.  You're not going to be able to piece that together for the price of this kit from anywhere, including from this vendor.

If you want to convert a couple of the taps to a standard tap, the ball lock taps are threaded, and an adapter to adapt it to a normal sankey-style connection costs $5-$10 (look for beer tailpiece with 1/4" MFL).  There is clearance within the fridge for the air hose-to-adapter-to-sankey tap configuration without having to resort to a low-profile sankey tap, though you'll have to tilt the keg to get it through the door because it will be slightly taller than the door opening when configured like this.  Also, the beer lines of this kit come set up for normal sankey taps, and you'll have to remove that fitting in order to run the included ball lock.  So, even if you really just want to run normal sankey taps, you can throw away the ball lock taps, buy sankey fittings for the air lines, and still be way ahead on price.  I'm running 2 and 2 right now.

Now for a list of observations in no particular order:

The packaging of the kegerator is shockingly robust.  It's in a really nice custom crate with metal blocks that hold the wheels in place.  All the crating around the kegerator is sawn plywood and not just cheap wood.  You're going to want a pry bar to get this thing apart, as each joint has 3 nails securing it.  Very impressive.

The packaging of the rest of the stuff is kinda meh.  You'll get a box with the tower in it, and another box with everything else.  They will be cellophane-wrapped to the top of the kegerator, and all of that to the top of a shipping pallet.  The two accessory boxes came pretty bashed up on mine, but there was no damage at all to the stuff in the boxes.  They're mostly air inside the box, so they seem to crush easily on the corners.

Take a close look at the return policy.  Everything has to be returned in the original containers and in new condition, and there's a restocking fee, and you pay shipping.  As I noted above, the beer lines are set up with sankey-style fittings that are crimped on.  You have to cut the lines to install the included ball-lock fittings, and doing so makes the item non-returnable according to the return policy.  Same with the 4-way CO2 manifold, which comes with mounting hardware, but you have to drill some holes to mount it, again making the unit non-returnable.  You need to make darn sure you are happy with the size of the unit and the noise level of the unit before you assemble it all, and if you're not happy with that, you're still looking at dropping a few hundred dollars to return it between freight fees and restocking fees.  I don't think policy is non-competitive vs. other commercial kegerator suppliers, but remember this is not being sold by Amazon, so you should not expect Amazon's return policy.

My unit did not come with diamond plating for the floor.  Instead, it came with a heavy rubbery plastic waffle mat.  The listing very clearly specifies diamond plate, and it's in the photos, so I expected diamond plate.  That being said, I think this mat might be better for my usage (which is at home, not commercial), as it seems to absorb shock quite well and may dampen some vibrations.  I did not call to complain about it, but really if you're going to list diamond plate, you shouldn't swap that out for something else without any notice.

It took a friend and me about three hours to set it all up.  Some of this was time wasted arguing about things like where to mount the gas manifold and which screws to use for the tower - the ones that came with the tower or the ones that came with the kegerator.  But there are a lot of parts to assemble here with the four tap system.  If I had to set up another identical one, I could do it in about an hour, I think.

There were some quality issues with the factory assembly.
- The door seal fell off the first time I opened the door after uncrating it.  I apparently didn't get it back in quite right (you need to use a screwdriver or something to seat the seal into the track at the corner - you can't just press it in or it falls back out) because it came off again a couple weeks later, which ended up making the door not seal properly, running the compressor for about 12 hours straight and freezing all the beer before being discovered.
-The tower mount sleeve in the kegerator is two pieces, with the top piece keyed to the top of the kegerator, but the bottom piece just pressed in place, and the holes were not aligned between top and bottom preventing the bolts from going through.  It's pressed in place quite tightly, so it took some time to determine it was not in fact glued in place and to get it loose to align the holes and reinstall.
-Two of the screws holding the faucet T-top to the tower were loose.

The unit is loud in a very weird way.  The compressor itself isn't all that loud, and it doesn't run that often once you've reached a stable temperature with the kegs.  The problem is the internal fan that runs 100% of the time circulating air in the kegerator.  For whatever reason, that fan causes the entire unit to vibrate slightly - the door, the tower, the sides, the kegs - everything vibrates at the same low frequency.  The low frequency vibration of the sheet metal sides casts out beams of low frequency hum that reminiscent of maybe 20 fluorescent tubes all humming together.  By "beams" I mean this is highly directional where if you are about ten feet from the unit, you can stand in one spot and hear nothing, and then move 1 foot to the right, and be inundated with hum, and then move another foot and it goes away. If I press my hand firmly against the center of the side, I can significantly mute the noise. The manual says if the unit vibrates, make sure it is level.  Leveling mine did nothing to dampen this. This is the only real drawback to this unit.  It would likely not be noticeable in a commercial setting, but if like me, you set it up in the bar of your man cave, it is not ideal.  You might want to consider a homeowner-grade kegerator, as they omit this fan completely (which has the drawback of not being able to chill the tower without adding a tower chiller with a small fan).

The installation instruction specify to make sure the air hose goes all the way up the tower, but the air hose is not actually long enough to go all the way up the tower, as far as I can tell.  I was able to get mine about 1" short of all the way up prior to it pulling out at the other end.  The tower stays nice and cold.

The tower is insulated, but the T-top faucet box is not.  I don't know if that matters, but I found it interesting.  There appears to be plenty of room in there to insulate the 3 non-faucet sides and the top with some rigid foam without blocking the tower inlet, and I may try that to see what happens, as I have a sheet of rigid foam lying around.

You'll see a lot of people online recommending 12 ft beer lines, and this comes with six.  The six seems to work just fine for me without foaming.  I'm running ~35 degrees, 12psi CO2.  It pours fast and well on both a pale ale and a brown ale.  Make sure you bleed the keg pressure down to your desired pressure when you first tap a new keg, as they can come in pretty high from the brewery and cause a lot of foaming.

The thermometer that comes mounted to the air box in the back is not super helpful.  It seems to be strongly influenced by the evaporator temperature such that it'll drop 10-12 degrees whenever the compressor turns on.  I'll probably move it more towards the front or get a digital one.

Though there is a shelf on the back to install the CO2 bottle, it barely has enough headroom for the bottle.  The two-gauge regulator does not fit in the normal position (I think if you had a 1-gauge regulator it would fit fine).  I had to cant mine forward about 45 degrees to clear the top, but then you have to rotate the bottle to clear the back, so the regulator sticks slightly into the keg space, and it's aimed down and to the right, which makes it tough to read. It's not clear that you can fit 4 kegs in there with the regulator jutting into the keg space like this.  I note on one of the manufacturer's web pages it says you can do 4 with an external CO2 mounting kit, but the other pages do not mention this limitation.  I don't yet have 4 kegs, so I can't say for sure. The back of the kegerator has four tapped holes for the external mounting kit which is available for around $25 if you call the seller - I am awaiting mine as it is backordered presently.