I've been in love with Reapers for a while, after they played it live back in March (a day before my b-day even, yay). Best song they've released from Drones by far. Psycho is pure shit, and Mercy and Drones were okay. Mercy sounded a little Black Holes and Revelations like, which I enjoyed, but I don't find myself wanting to listen to the song very much.
Did you see they released The Handler today? I need to let it sink in more, but it's great. Reapers and The Handler are easily the best of the group we've heard.