I've been using this as the amp for recording a lot of electric guitar and violin for several different people's music, and it's great. I only plug in my (actual) Princeton Reverb on occasion! I use it with pedals into it, trying to keep the amp settings with less distortion—to be honest, most of these amp sims are distortion boxes—but the reverb, trem and speaker controls are excellent. for tuning things in.
That said, there are a couple things that kept this from a 5-star review. One is, I'd just like more volume headroom. My 1972 Deluxe Reverb and the Princeton are pretty clean till you get up to 4 or 5. The Dream '65 gets dirty pretty fast. Some of the distortion tones are good, some are sort of too fizzy when it gets hot.
I'd love a way to control the wave shape of the trem more, but maybe that's less authentic? I'm used to a different sounding trem shape from my (newer?) amps.
And, man would it have been helpful to be able to use this device as a audio input to the computer rather than cabling it into the Apollo! That wouls kick ass, especially for on-the-go stuff.