I like the 5150 Combo. It's a different animal than the head, but still in the same 'realm'. The circuit itself is something in between the 5150 and 5150 II. Still sounds like a 5150 though. Being 50watts make a difference as well. Lowers the head room a bit so you can get the power tubes screaming a little earlier than with the 100 watter, if you are into that. Otherwise, it's just as loud as the 100w brother, you won't notice a difference in a band situation hooked up to a 4x12 cab.