Yes I have, and it really is a great game. Once you get used to the mechanics it becomes very intense and PvP matches are wonderful. The only flaw it has is the lack of Gundams that are state-side right now. My player name is 'CrimsonBeats' if anyone wants to Co-Op or PvP me :3.
I'd grab it just because it's Gundam, but I could never take the SD series seriously. I remember there being a game just like this a few years back where you could literally build your robot with different parts/weapons. Can't remember the name. Anyone know? :\