Product review (4 stars): Long review
We just got this today. After having spent half the day installing it, and a little time cooking on it, here are my thoughts. See the attached pictures for details...

SHIPPING
Came double boxed and nicely packed. The entire package weighs about 40lbs, most of that being those heavy grates. Everything that should have been included was included.

MANUAL & SUPPORT
The manual is not very useful. WindMax is putting the exact same manual in all their models of cooktops. There are no useful installation instructions. The manual amusingly mentions how the cooktop supports "natural gas, propane, or unnatural gas."

When I was trying to order this item, it was out of stock. I tried contacting Windmax on Amazon about availability, and still have received no reply ten days later. I expect any attempts to get post-purchase support would get a similar response.

INSTALLATION
It has feet on the underside as if it is designed to sit on top of a counter. It includes a nice cardboard template so you can cut out the right-size hole in your counter (875x410 mm, 34.5" x 16.15"). The gas connector is underneath towards the back, about 1/3 of the way from the left. As you can see in the last photo, it includes adapters for 3/4" flare connector, 1/2" flare connector, and clamped rubber hose connector. Using the bigger flare adapter, I had no problem connecting it up with a common-place stainless steel gas connector from a home improvement store here in the USA. It also needs an electrical outlet to plug in - this is for the igniters only, and you can still light it manually if the power goes out.

If you need to use this with propane (LPG), a conversion kit is included, but you will have to look closely at the propane nozzles and match them to the right burner, because no conversion instructions are included.

Besides the gas connector adapters and the propane kit, the box also includes four little black plastic nubbin things that I didn't know what to do with. It also included about 8' of adhesive-backed foam tape. Without any useful installation instructions in the manual, I just stuck the foam tape on the bottom edges of the cooktop to seal it against the countertop.

My main criticism of the installation process is that there does not seem to be any way to fasten this in place if one is dropping it into a hole in the countertop. It just sits in the hole and can shift around if the hole is not a snug fit. There should some brackets to facilitate clamping it to the underside of the countertop.

If you're not comfortable doing plumbing for gas, you might want to have a professional install this so you don't blow up your house.

IN USE
I would prefer a bit thicker gauge stainless steel for the surface. We'll see how it holds up, but I can imagine it getting dented if something gets dropped on it.

The grates are nice and heavy-duty and provide a more-or-less continuous surface for moving pans around on.

The igniters for the two biggest burners are outside of the burner rings and could easily be damaged if something drops on them. The igniters for the four smaller burners are better protected.

The control knobs not super-heavy, but they are all-metal, which is better than I had hoped for at this price. The printing on the surface next to the control knobs is raised and will probably wear off like another reviewer said.

My biggest criticism in-use would be how the gas valves feel. When turning the knobs down from MAX, you have to go about halfway to MIN before the flame seems to get any smaller at all, and then it gets much smaller at once, and then the rest of the way to MIN it shrinks only a litle more. In my mind, the valves should give a consistent response throughout their range. As it is, it will require a bit of fiddling to adjust the flame.

It would be nice to have at least one burner that went even higher than 12k BTU - the high-end competition seems to go up to 18k BTUs or so, and the extra BTUs are mainly helpful for boiling pasta quickly or doing good high-temperature wok cooking.

OVERALL
I think it's a great value if you don't mind living with the quirks I have mentioned above. We bought it because our old cooktop had a broken igniter on one burner, and because it was impossible to clean. My wife is happy with this new one and the quality is good enough that I don't imagine replacing it even when we get around to remodeling our kitchen.

To WindMax: If I were purchasing again, I would pay another $100 if I knew the following issues had been fixed:
* A stainless steel surface that made from a bit thicker metal.
* A helpful manual that describes the particular cooktop it comes with and has better installation instructions.
* An good way of securing the cooktop into a counter.
* Gas valves that provide a better response for adjusting the flame.
That price point ($360) would still be half of what the name brands are charging, especially for a six burner cooktop.