I've had great luck with mine..
I tend to treat my 'Berrys pretty poorly. I'm just rough on them, and my expected lifespan for one is about 6-8 months. I just hit 7 months on the 8900, and it's still kicking.
I even toss it to the ground from 8 feet up in the air in front of iPhone users to show them that their phones suck. No iPhone user would ever be able to get away with that kind of phone abuse.
RIM makes a quality product here...