Myself. I run Anima for >>46103370
and the other member of that particular group, and am considering running Only War for >>46103121
I try hard to get details right, come up with challenging battles, and keep the players on their toes and interested in the game. Sometimes I know I miss small details. I also occasionally disregard/fudge the rolls against the players, usually to rescue them from my own mistakenly OP encounter that shouldn't have been.
And after every session, I make absolutely SURE to ask how I did, because I always feel I could've done it just a bit better, somehow.