I have the Crimson 350's, used them to power my Ulfberht speakers. Very nice tube amps, but I went with BHK 300's for more power. The Carvers are an interesting design that run the tubes very cool, they only get lukewarm even after hours of use. They have adjustable feedback to change the tone of the amp, from a more solid-state sound to a more traditional "tubey" sound.
If I did not need the extra watts in my setup, I would have stuck with the Carvers.
If I did not need the extra watts in my setup, I would have stuck with the Carvers.