Product review (3 stars): we've been very happy with it
I bought model KUDS30IXBL4 via a local appliance dealer in late 2011.  Overall, we've been very happy with it.  It cleans dishes well if the right detergent is used.  It is very quiet.  But it has some issues.  Very infrequently, the controls become unresponsive.  This might not happen for a year, or it might happen twice in two months.  Turning the circuit breaker off and on usually gets it working again.  I suspect the "console" (the keypad/LED component) though it could be the controller or something else.

The other issue, seemingly common, is the plastic clips that hold the front wheels on the upper rack eventually break.  This is because of the design, and also because the wheels hit the stop when you open the rack.  Several years ago this happened and we managed to get replacement parts from Kitchenaid.  A few months ago it happened again, and I just flipped the right and left sides so that the bad part was in the back instead of the front.  It worked just fine this way, but I knew it was just a matter of time before it broke again.  It turns out that Kitchenaid now has a redesigned part that has the main body of the rack adjuster made out of metal.  The wheels are sturdily attached to the metal body using plastic hubs and screws.  The part number for this upper rack adjuster kit is W10712394.  You may be able to get it from Kitchenaid for free if you ask nice, or it looks like it can be purchased online for not too much money.

My previous Kitchenaid lasted over 20 years.  My impression of Kitchenaid/Whirlpool is that they make pretty decent stuff and stand by it pretty well.  Repair parts are available and are not outrageously expensive.  It stinks that labor is not included in their warranty.  Fortunately, I can do things myself, but they refused to send me a replacement console under the five year electronics control warranty.  They want a service technician to do it, either to make sure the correct part is being replaced, or because of a liability/safety concern.  Unfortunately, the labor cost is similar to the cost of the part, so for me the warranty has little value for this issue.