I saw there was a beta and I tried to get one of the keys from the giveaway sites, but unfortunately I was too late -- didn't notice the giveaway until a few hours in so I didn't get one.
How is it? It looks really cool -- my biggest issue is that there isn't any healing in the game, or at least not a healing class, kind of like GW2. And that annoys me. I think to be able to go out and PvP in groups, with a healer.