So...had a go at rehearsal tonight, I won't say any more until I've gigged it but a couple of early thoughts.
Firstly, it's unbelievably powerful, I didn't go above 3 on gain and 2 on master (compared with halfway on gain and master on my 700W solid state SWR)
I ran it through my pedalboard which apart from a Boss TU3 tuner is a Dave Hall Amp VT2-EQ tube pre-amp pedal and a Tube Markbass Compressore, so there's a lot of tubes going around! It's hard to describe the difference with a solid state amp but my initial impression is a thickness or a richness that isn't present in the SWR, and an almost effortless output that didn't feel like it broke a sweat. As I said it's hard to describe but it felt like it was saying " come and have a go if you think you're hard enough", I felt a bit intimidated!