There you have it, if Sprint is recognizing it I'm sure our phones will get replaced no questions asked if the vibration motor fails.
I for one have been using it for two weeks, and all my notifications and alarms vibrate like crazy and the motor is going strong and I don't expect it to die out any time soon. Just because a few Diamond owners pop up in the forums saying that their motors died doesn't mean that every Diamond's motor is faulty. In these situations is just luck of the draw and it isn't mentally healthy to be living in fear of it dying. At least thats my $0.02. Hammer the **** out of it!! If it dies thats why you got an insurance plan right?