My cab has arrived.
I've only been able to have 30 mins at lunchtime but I like it - paired with my existing One10.
With the tweeter control at zero it sounds just like the One10. With it maxed there's a pleasing high end that is very nice for slap and for chord stuff at the dusty end.
Envelope filter stuff seems to come through a bit more in the highs too. Some of my drive sounds are now a bit fizzy so I'll have to tweak them.
There's nothing brittle or sharp about the highs - I'm assuming that will be party to do with the tweeter and partly to do with the amp itself. The treble control on the amp is 6Khz but I have no idea what the Q is, or whether there is a LPF somewhere to get rid of the horrible stuff at the top.
As I stated up there ^ about hissy things, I have had Mark Bass amps in the past that were hissy with MB own cabs. My current Mark Bass is the AG1000 and even with the treble maxed and the tweeter maxed there is no hiss - not even with my compressor on. Very impressive.
It's about a Kilo heavier than the One10 but still very light at 8.5kg.