I considered the Triaxis, but went with the Recto pre purely for simplicity. In the context of what I play, I need only one extreme gain crunch channel, I rarely play clean, but the clean on the recto pre is impressive and I'm not a soloist, I'd rather kick it with the drummer and bassist and hit the grooves.
After spending the last week with it I'm starting to get more comfortable with it and learn more about it's capabilities and also what it lacks. Since I use a ridiculous amount of gain I added an old Alesis 3630 comp/gate, it works, that's about all I can say other than I'll be upgrading it, lol! I also use 2 completely different cabs so I like to eq them very differently, so I put my old Alesis M-EQ230 to work. Time consuming to tweek, but well worth it. Still not quite satisfied I added my trusty Aphex 104 just before the simul-class and a Maxon OD808 just before the pre and the sound is phenominal for what I play.
I should add that while I'm working on this I have the pre on modern and the simul-class on modern, once I figured out that you could stack the deep mode on top of the modern, holy crap! There was the fury I was looking for, lol!
While I like the flexibility of my Marshall 9200/Digitech 2120, I'm very satisfied with the switch to Mesa/Boogie.