I've owned the CAT JL2 for a few years, and now own the Music Reference RM9 Special Edition (Modjeski)and these are among the finest amps I have heard, but for speed, detail and transparency and presence (the others are obviously no slouches in these areas) I think the Atma-sphere M60s are very tough to beat with the right speakers (I own Merlins which are OTL friendly - highish, smooth impedance)- I wish I had not waited so long to try the OTL waters.