I was a Blackberry Storm user, and let's just say that my experience was less than exemplary. I gave Blackberry (via Bell) an opportunity to move me to a different smartphone but they would not, so I switched to an iPhone 4 and couldn't have been happier with that decision.
Blackberry, if you had been more preemptive with your dissatisfied customers then I'm sure your company wouldn't be tanking the way it is. Heck, I won't even consider your Playbook tablet because of my previous experiences with Blackberry.
Maybe it's time to do what HP did with their TouchPad -- dump your products on the market at incredibly low prices to get more customers, but then take care of those customers to keep them happy!