A couple of rehearsals and one gig in, and so far it's exactly what I hoped it would be.
I've run it flat, apart from dialling in a smidge of contour in at the gig. It's VERY quick, dynamic and responsive.
There's a two-speed fan which works pretty hard when it's needed, but it's not intrusive, and switches off when it's done its job.
I haven't tried it full-pelt yet, and I haven't tested the DI - that's still to come over the next couple of weeks, but I reckon it's going to be spot-on.
Here's a photo from the gig...