I carry a Droid 4 (because I like the keyboard) which was running Android 4. Which was absolutely unusable for the web, but alright for ssh, xmpp, and as a camera.
A few weeks ago I replaced android on it with Linux (Maemo Leste) which is… great but also very rough.
I mostly use my phone as a wifi remote to control my computer. That’s working much better now than under android.