I know I'm a little late to the party (just as I was when I got the Droid 2 Global), but I also chose the Droid 4 as a 2nd phone to be used strictly for business (still using the old D2G for personal). The slide out keyboard is a must for me. I never took a liking to the touch screen keyboards. With my relatively large hands and fingers, the touch screens and I don't quite get along, besides typing the same letters more than once and having to backspace all the time.
As far as the phone itself, mine shipped with Android 4 ICS. So far so good there.
I also have so many new features and apps, I have yet to try most of them. Anyway, I think I'm going to enjoy the 4G network speed, front-facing camera and 1080p video with HDMI output, hotspot/tethering etc., etc . . .
I would like to see any (good or bad) feedback from longer-term users if possible.
Rick @rcl4rk