I have seen it in its entirety, but I didn't find it as engaging as everyone else seems to have. I didn't much like the whole Mu stuff....
It was a fun show, but I'd characterize it more as a rental than a buyer. Character design is pretty nice, though, as is mecha design (other than the Mu and stuff...). I also like the music, but the story was just kind of 'meh' to me.
It is really pretty, though....but I found Evangelion to be more interesting....