I had one of these a few years back. Very fine (Raven Labs was Steve Rabe's short-lived company he formed after he sold SWR to FMIC), but I would DEFINITELY suggest some low impedance headphones, with 240AKG's or similar impedance cans it can be a little quiet.
Or if you're used to levels less than I am (sorta like standing in front of Townshend's stack in the old days), you'll probably be fine . . . . .
J o e y