I just got done watching the first episode of K-On and Phantom ~Requiem for the phantom~
K-On is fantastic. I can tell that after one episode KyoAni is going to win me over again and I'll be following it the whole run. According to MAL, it's only going to be 13 episodes which is a little disappointing, but I have a feeling it will be one of my top watches of the season.
Phantom was....okay. It's a typical Beetrain production, so if you enjoyed Noir or El Cazador de la Bruja (the first episode reminded me A LOT of El Cazador), you'll probably like this as well. It has great music as well. Not sure if I will follow it or not...I probably will, just because I typically love Beetrain's productions, but the first episode of Phantom did seem a little cliche to me, after seeing their other stuff.