Product review (1 stars): recommended a replacement rack
I purchased  Bosch model SHX3AR75UC because of its ratings in Consumer Reports. I no longer have this model. After having problems with the bottom rack spray arm hitting the bottom rack when it's loaded with dishes, Bosch replaced the dishwasher.  Twice, Bosch sent a representative to investigate this problem before they replaced the machine.
 First, they sent me replacement wheels (not the slopped kind which came with it) which eliminated the derailing issue I was also having. Unfortunately, it did nothing to fix the spray arm hitting the basket.  The first representative they sent, after seeing that the dishes had been loaded properly and witnessing the  problem I was having,  recommended  a replacement rack; but the new rack, which looked exactly like the one I had, still encountered the problem with the spray arm.

 The second representative came and after confering with the office, manually straightened the spokes holding the wheels and pushed the bottom of the rack upwards.  This finally, eliminated the spray arm hitting the basket, but it really messed up the contact of wheels to rail!

Bosch replaced the dishwasher with a new model just out, SHX5AV55UC.  It was installed yesterday.  Since I was told that my problems with the previous model were probably an anomaly with that particular machine, and, I also expected the problem had been dealt with in the new model,  I welcomed it, anticipating a happily ever after!  Sadly, after loading it and spinning the bottom rack spray arm, I find I'm back with the same problem.

 For those who wonder what kind of dishes I have, they are ironstone, about as heavy as fiesta ware.
 I'm writing this because I have just had enough!  Before I sat down to write this,  I had loaded 4 plates, spun the spray arm-- and no exageration--the spray arm is hitting the bottom of the rack!  It is so unbelievable, I will post a video of it!
I have read other reviews of dishes not getting clean, could it be, in some of those cases, the arm is not spinning?  If anyone is having similar problems with the flimsy bottom rack, would you post it.

Previous to this dishwasher, I had a Kenmore and had no issue with it  except for the noise.  And although I can put up with the Bosch's not drying plastic, the beeping, all of which I was aware of--  I do like the quietness of the Bosch, the design, and other features which others have listed, as well as their customer service. But this particular problem I'm having makes this dishwasher unacceptable.