I haven't been able to connect to a server with it yet, the ones I tried may not be updated yet, so I played Single Player.
My biggest issue, LAGGGY!!! when you first get into the map, you really can't move well then after the new chunks are done loading, and you go to move, you lag some more...
I like what I am seeing content wise, new trees, colors!. I actually forgot how fun Single Player is. Multiplayer is TOO easy... :P