I've done two gigs. In both cases there was a PA with 15" bass bins it was a bit academic. It's a powerful PA (3kW) but not run ridiculously loud, I have the Orange Bass terror at about 8:30 volume with gain about 3:00 and tine controls pretty much at noon, so not working hard at all for plenty of volume.
On the second gig I had to turn down as I was too loud for the PA. Then on the second set we played half the first song with everything but the vocal on mute. No-one noticed the difference - I was subconsciously digging in to make up for the reduced volume and then the PA came in and the roof nearly came off!
Second gig had a mate who does pro audio in the audience and he said our sound was cracking, the landlord booked us for New year and we got another booking but i'm not sure all of that was down to the cab...
Two issues - one of the feet has come loose and I've cracked one of the corner pieces. It slid off a chair, then tipped over so one corner hit the skirting board pretty hard. I suspect most speakers would have been unscathed, but it was quite a whack. The problem is that the cores of the carbon panels don't give the screws a lot to bite into, one of them was pulled loose and that allowed the corner to flex and split. The cab itself was fine. I plan to fit bigger, self-adhesive feet anyway (I don't like the little ones). As for the corner, I might ask for a replacement, but as I have a 3D printer my most likely plan is to print slightly bigger, thicker corners in TPU (a flexible polymer) which will be much more shock absorbing.
My feedback for GR Bass will be to fit much more robust corners and consider some sort of inserts or reinforcement where screws are fitted.