I love 'em!
I've got the Triaxis, and the RectoRecording Pre-
The Recto does Recto-very cool rock and roll , w/metal tendencies
The Triaxis is by far the most versatile-Does Marks 1/2/4,Rectos, and great cleans and drive...
It's archaic, and could use a update into the new millenium-
membrane buttonpads, and stoneage navigation/programming, mono out fixed mix effectsloop, and lots more besides, but DAMN, is the tone there!
Realttime midi control is also great-midi expression pedals like the ART x-15. etc, can control any parameter or combination to do fantastically useful tweaking while you play-my favorite settings use one pedal to control gain and lead drive simultaneously, while the master volume sits unaffected-from crystal clean, to molten shredding death, & back...
Can't say enough good things about this preamp.
If you want one mesa preamp, let this be the one.
-It does mark IV-
it IS mark IV,II,I, and Recto preamp circuits in one box-