Had a little time to play with this yesterday. I WISH it had some sort of bass knob to complement the hi cut knob.
Drive, for me, leads to a bit of a muddy mess on the 800 setting, but works a treat on the higher frequency settings.
Cleaner settings iwith just a hint of drive do a GREAT job giving a blackface style amp the warmth, intimacy and immediacy that a mid-forward tweed amp has.
Haven't stacked it with anything else, yet, but expect the higher frequency settings to work really well behind filthy pedals.
Worth $300-something? If I were all in on an analog rig, probably. The ability to so useably convert blackpanel amp to a tweed-ish amp and sound soooo intimate is pretty powerful. In my current digital enviro, it'd be a hard sell. A lot of what it is really good at could be done by just changing amp models.
At sub-$250 I'm not looking at it thinking "ugh, what a waste!" and given that I always MIGHT go buy an amp of some sort, will probably hold onto it.