I have the Canary monoblock pre-amplifiers and they were very good in stock form I had the modded by Bob and Gary Backert of RHB Soundezign and they turned them into phenomenal pre-amps. Exceptionally clean and clear sound with great imaging (depth and height to the soundstage), really nice tone colors, and a nice touch of tube glow without any overhang. I love them dearly and do not lust after other pre-amps.