Very good! I like all three voicing but usually stay on the blackface. You can also split your guitar signal and run into multiple amp inputs letting you blend the BF with the tweed or blonde. Back off the gain and it's OK with acoustics. I'll be interested in your impressions after you have some time with it.
Congrats
It's been kind of a busy weekend with family (and new cat) stuff, but I managed to squeeze in some quality time after lunch today with this beastie. I
love it! I did all my experiments with the PRS Hollowbody II Piezo.
I also prefer the blackface voicing, but all three work well. The tweed is nice at maximizing the effect of upping the gain a little. I ordered a Y cable so I fully intend to experiment with combining the voicings as you suggest. I really loved how clear and articulate the tone was in both blonde and blackface even when the gain was maxed out.
My two favorite things thus far are to start with either the gain or the speaker volume completely dimed, and the other one fully off, then bring that other one up gradually until the volume level reached what I want. Those are now my full-dirt and full-clean settings and both sound so damned nice. The limiter control is starting to make more sense to me now, as on full-dirt I was able to mess around with that and it makes a marked difference in how the breakup sounds.
I didn't bother to touch the EQ. It sounded so good with all three dials at noon.
I played with both the magnetic pickups and the piezo, and even with a ton of gain the piezo sounded really cool. On full-clean with the blackface voicing the acoustic/electric tones out of the PRS were crisp and sparkling.
I haven't tried it with pedals yet but that's coming soon.
I don't think I could be happier with this amp!