It's good for phone calls and e-mail. It begrudgingly plays host to a few native apps for Blackberry OS, but not a whole lot. If I really want to use something like Facebook, I use the mobile browser version, but it's enough work to not mindlessly reach for it. So, the device is good for objective work things and not that much else. Its excellent physical keyboard also makes typing less frustrating and cognitively stultifying, since I can do 40-50 WPM on the thing with nearly 100% accuracy.
But getting away from all the apps and the notification overload has made my life considerably less anxious, if not ideally so. I'm still very OCD about being on top of my e-mail, but that's primarily due to the 24/7 always-on nature of my business rather than being glued to the handset per se. Every once in a while, I miss the convenience of some Android or iOS app or another, but for the most part it's a nonissue, and the upside of the liberation definitely outweighs the inconvenience.