This version seems very laggy compared to 70. For example maps load a lot slower and players appear to jitter up and down and stutter around. Don't get me wrong, in 70 they sure as hell stutterstepped if you had some lag, but it appears that input is no longer applied clientside, so enemies appear to be standing still and teleporting around rather than walking and stuttering. This makes it a lot harder to hit people!
Also it seems like all hits are calculated serverside? Because hits lag a lot, sometimes it is a few seconds before hits take effect, it really magnifies the "well I shot him in the head before I died so why isn't he dead!" effect.
All in all it seems to be horribly laggy and jittery, barely playable. Hopefully the OpenGL version will aleviate some of this by shifting work to the GPU, but I can't help but think that the move from client to serverside operations such as hits is a big factor in playabiltiy.