Mine was installed 3.5 weeks ago with a defective part on the top rack.  The installer ordered a new one right away --it was supposed to come today, but i got a call saying it is not here yet.  So I have to be very careful pulling the top rack out and filling it.  I've learned to put it back where it belongs when it falls off of the wheel, but it's scary when that happens.  Dishes come out very clean so that's good, but I'm frustrated.