I don't like his skills (both normal and fused+ forums) either. They made Rehab sound so big and great when he came out and changed his info 2 or 3 times, but the real issue was with his skill. If I were to summon two rehabs there is little chance I would level them and fuse them, more than likely I would trade them off for BB.
Would be my first UR and one of my team, but I just do not find his skill useful and the MP cost for an UR that I do not like the skill of, kind of pointless in a team. Maybe a status item, but that is about it.
I think if his plus form got a simular skill to the new mech's +form then rehab would be loved by all dragon users.
Hypno kitty will make you feel better..... and make you trade me everything, ma ha ha ha. :-).