I'm actually using a Titan Pocket currently. Works well enough for me. The security updates are lagging behind that's getting me considering switching back, but I'm otherwise cautious how I use it.
It's a nice feeling device, and makes me wish they'd make more BlackBerry style phones with bigger displays and Android capability.
People see you whip the titan out and think "oh he's doing that rollback technology thing", then you use Android Pay and they really flip out lol.
I hope more manufacturers would adopt the Blackberry style of phones. Titan Pocket has proved that you can have Android running decently on such a device. So why not bring back QWERTY keyboards?