Impulse pre-ordered the game despite the fact i'm going to begin playing Rift at pretty much the same time as this releases. I'm an Arts student, so I have time for both anyway :P
Sandbox games make me very happy, though. Haven't played too many, but spent quite while on Wurm (which I really enjoyed), and gave Mortal Online a shot too (Well, I didn't actually buy it after the beta, but I tried to like it) Also played Darkfall, but I was so far behind the curve that despite the fact I enjoyed it, I didn't stay for too long.
Hope to see you all in game, anyway. Xsyon looks like it will be a blast!