I still do, it's great for Andoid, iOS and even desktop games. But the lack of UI (not sure why they still haven't provided it, fails on the App part of AppGameKit) and poor HTML5 suppor (the payload is very large and slow due to the AGKPlayer, and several things don't work).
I used to split my effort between Monkey and AGK years back, but left Monkey due to the changes and lack of support. But now that I've discovered Cerberus, I thought I'd give it a try. I like what you've done with, clean, good docs, great forum, good support for different platforms. Well done.