We've owned the stainless set since 2008, and it's been a great set to have.
One of the best things about the set is that they are pot-rack friendly. You can hook the lids onto the handles, and everything hangs on one hook, so you don't have to store the handle separately.
Cleaning is easy, we've never noticed the pot handles getting particularly hot, and they haven't discolored or anything.
The only complains I have, and it's pretty minor, is that the skillets are a little too narrow on the bottom. They're fine if you're doing a sauce or something, but if you're used to working with a traditional cast iron or Revere Ware, it may be a little frustrating.
We did have a slight problem with some pitting on the cooking surface of one of the pans when we got the original shipment. We were able to work with the vendor to get a new pan, so it wasn't a big deal. We haven't had cause to use the Kitchen Aid warranty, so can't provide any help there.
I'll be happy to check back in to answer any questions if anyone has any.
edit: I have a 5 * review up on Amazon's page.