I'm a newbie to the Spine / LibGDX world, and just wanted to say that I'm really digging Spine so far. I've come from an Adobe Flash background and haven't had much luck finding good 2d animation tools out there, until now.
It didn't take long following the tutorials to get my first spine animation into my game. Spine does a lot of things I've been wishing you could do with Flash for years. Animation interpolation, loop offsets, non-proprietary output, a good motion editor, intuitive hotkeys, and a great, stable UI. I love it!