It's quite fun although there is a ton of mouselag and the netcode feels kinda weird.
There are currently a lot of people playing, definitely try it out.
Bigger thread here
I played a game here: http://www.twitch.tv/jigglywigglyx/c/4900560?t=13s 6:40 got a nice monster kill.
Download here https://ut.rushbase.net/raxxy/Builds/