Thats a combo right? 12 band eq, 2x10 w/ a tweeter. If so, I believe it's 300w. But don't let that fool you. Trace watts are conservatively rated, and should be very loud. Heres a link to the instruction manual, to get some more info on that amp. [Invalid or Expired Link Removed]
I don't have any direct experience with the combos. But I have an AH250 7 band trace head, which is phenominal. Trace Elliot makes extremely good amps. Built like tanks, reliable, very lound, fantastic tone and extremely versatile. I think 400 is a good deal for that. Add a 15 cab, or 2x12 and you'd have a kickin rig.
I'm sure some of the other Trace Elliot afficianados will be along soon with some more feedback for you.