Recently I started playing TERA; recent as in, I haven't even hit level 10. But the only reason I started playing is cos I got wind that TERA will be going Free to Play sometime in February (ever since WoW I no longer play any subscription fee based game). And I tell you, after playing the Unlimited Free Trial, the game is AWESOME! In my personal opinion, TERA is much more fun to play than Guild Wars 2 (more fun, I never said better).
I highly recommend you play TERA with a controller, either a 360 controller or a PS3 controller (I think it supports a PS3 controller; I know for a fact it supports a 360 controller as that's what I use). Just remember to change a few key bindings to suit your preference. Really, the default key bindings really aren't that great.
Anyway, who care's about what I'm saying. Onto what En Masse Entertainment is saying: