Been using Liberty GB for almost a day now and I am impressed. It is very fast, like I would expect from Liberty. No real big issues that I have come across. The biggest issue that I had was not being able to add accounts through settings. I was able to add through gmail, so no huge deal. Jrummy knows about the issue but it did not happen to everyone. Have had no issues with apps since most have already been updated for GB. That all said and done, with as good as this initial build is, this is looking like the best Liberty yet.
When I get some more time, I'm going to flash over to the ota leak to get a better idea of the differences. I'll keep you updated.
If you're flashing to Liberty GB from an sbf I would recommend using the bootstrap in the Liberty toolbox. I bricked on my first time flashing and the only thing different was using that instead of DX Bootstrap. Flashing from the Liberty toolbox works great.