About time I bumped this baby!
I've read another thread around here from a guy selling another similar amp - the older, less powerful SWR "Super" Redhead - and he has been reckoning it's not loud enough for his needs. I have used the old super redhead at a venue the provided its own backline and it was using this amp which inspired me to buy the lastest version for myself, although I never had to push the Super Redhead because it was a smaller, jazz-based band in a smallish venue.
Let's get one thing absolutely straight... this amp is more than loud enough for 99% of everybody's needs... (unless you are in 30-piece death-doom-grind-dead-heavy-hard-metal-core band and you have to stand 30 feet away from your backline)
I've been using my amp in a live 6-piece soul/disco/funk function band standing next to a really loud rock-based drummer and a singer who can rip your ears off... and I've never had to take it past 1/2 or its power capability! This thing really shifts some air! Maybe the extra 50W the new Redhead has over the Super Redhead makes all the difference. I would also usually extend it with a Trace Elliot 1x15" and get something like 650W out of it... it becamea skill to tweak the volume pot in small enough increments not to go from too quiet to too loud