Product review (2 stars): Otherworldly noise
I bought this unit after a glowing recommendation from a salesperson at Home Depot.  She said that she owned a unit and loved it.  The finish and price seemed to suggest "quality" to me, so it seemed like a no-brainer and between that and Black Friday discounts, I ordered one. Did I do research?  Noooo.....  Well, buyer beware.

At first the unit seemed fine, it looked (and still does) great, and was *extremely* quiet, so I was happy.  But after no more than 10 cycles, it started making a very loud, high-pitched, continuous, otherworldly noise.  Like something from a Sci-Fi movie.  Think of the phasers on the original Star Trek from the 60s ... it sounded something like that.  Better yet, go to youtube and search on the model number.  You'll find several videos demonstrating the exact same noise.

I called LG for service and I spoke to a very helpful, very polite service rep.  He didn't hesitate in issuing me a service ticket with a local independent repair company.  They got an email authorizing the service visit, and I called them and set the appointment for less than a week later.

When the tech arrived and I described the symptom, he seemed to know of the problem, had addressed it before.  He'd evidently replaced a lot of motors on this unit.  But what he went for first, once he got the thing open, was the "chopper blade".  It's a roughly 2.5" blade in the bottom of the unit under a cover.  The blade lies flat, parallel to the floor, and is sharpened on the leading edge, the better to chop up food particles before they go out with the wastewater.  According to him, "they told us" (I don't know if that means LG or his company or someone else) to first try removing the blade, turning it over, then reinstalling it to see if that cured the noise. In my case, this made 95% of the noise go away, so I am mostly satisfied with noise levels at that point.  However, with the blade turned over, the sharpened cutting edge is facing the wrong way, and the blade now depends solely on its speed of rotation (I think the tech said 3000rpm) to chop up the food.  In other words, to fix the problem, the functionality of the unit has to some extent been negatively affected.

I mentioned to the tech that it seemed to clean my dishes just fine.  This seemed to make him slightly happier, as if "not cleaning" was a chronic complaint that he'd encountered and was happy not to have to deal with with my unit.  That was just my impression, he didn't say that.  He *did* say "don't use it as a garbage disposal".  I don't know if most people are in the habit of doing so, but he clearly approved of me rinsing dishes before putting them on the racks.

In summary, it's my impression that the unit has a design defect that is well-known but hasn't been fixed.  I'm not a dishwasher engineer, but I'd think that some simple modification to the chopper blade would rectify the problem and could be made available as a field-replaceable part.

So as they say on failblog, "learn from my fail" and do your homework!