amberwave audio, have you heard them?

There are some mono tube amps (100 watts per channel) built in Nebraska. They were out at the Rocky Mountain show. Has anyone heard them? Opinions please.
Heard them the last two years at RMAF running Intuitive Design Summits (IIRC). They sound VERY good. Warm, smooth tube sound. Speaking of warm, those large tubes had the hotel room damn near boiling. That and the large size make them impractical unless you have a dedicated room and windows you can keep open.