I really liked the idea (and thought the hardware was pretty good on the Storm 2), but was too unusual on too-unpopular a phone to do much of anything.
BB never really understood how to do 'experience' - except in things at their core like battery length and keyboards. As nuanced and insightful as they were there ... it's like they considered everything else a joke, or didn't want to go deep.
The whole screen on Storm moved - neat idea - should have never made it out of the lab. Or at least, not in the manner it was. It was possibly ahead of it's time as I could feasibly see Apple doing something like this - the new MacPro trackpads are very, very nice. So subtle.
But it's all history now :)