I heard the Crimson at the axpona show in Chicago. It sounded very good driving the new ether planar headphone .I thought it sounded the best of the three amps they had for audition the others being the woo wa5 and the schiit ragnarok. I would place them as 1.the Cavalli Crimson 2. the Woo Wa5 and 3. the Schiit Ragnarok. Based on comments made previously the ether mates very well with tube amps . The Crimson is an excellent headphone amp.
It was one of my favorite review's! Sweet amp!