I’ve never used it ... a colleague of mine lives and dies by Blackberry ... he loves it. I fear he might jump off a bridge the day they go under! :-).
I think the term “crackberry” was made just to describe him. He was one of the 15 people that bought one of their tablets the day it was released (the same number of people that actually liked the Van Halen III album)!
Except the mobile business is so big that a million units are only a 1% market share.