You get used to the keyboard fast. It's soooooo accurate, I can touch-type on it (I haven't had to look at the keyboard once whilst typing this comment), and there are loads of shortcuts, like hitting "w" to open WhatsApp or hitting "t" to get to the top of a list of messages in the BlackBerry email app (called "Hub").
Not only that, but it's an Android phone with a touch screen, so I can use any of the apps anyone else uses too.
Love the tactile feedback, the ability to write without looking at the screen, not being dependant on an aggressive typechecker, having the ability to use the keyboard to scroll, attach shortcuts to keys and much more.
My current phone is a KEY2 and my previous was a Blackberry Z10. My primary use is private usage but text heavy and somewhat work related (via BlackBerry Hub although the android Hub+ app doesn't beat the bb10 gesture experience) but I do also use it for various app stuff (not games). It fits all my needs.
Imo. The touch keyboard interface simply doesn't beat having a physical keyboard. when that's said, having the touchscreen is still nice because games and apps are optimized for such handling but for text I'll keep looking forward to the next BlackBerry with keyboard (a new one is presumably being announced in q1 this year).
But the Sony Ericsson M600i is still my favourite phone keyboard. A modern device using that dual-key rocker QWERTY would be amazing IMHO.