I've been using this amp now as my main amp for ages... over a year I think. I also have the official markbass case for it, and have chucked it around in and out of my car boot, other people's cars and vans etc, it's fallen off seats and has survived well. This is only a soft case that flips open so you can keep the case on permanently.
Build quality therefore seems good, nothing loose or coming apart.
The tonal options are huge, especially with the low-pass filter, you can get really mellow tones for the jazz gigs, and with the tweeter you can get a really bright slap tone, the two extremes I end up gigging the most.
Paired with a 2x10 Markbass traveller the amp sounds great. Couple it with a 1x15 and you've got a monster rig at the full wattage, that has never failed to compete with even the loudest drummers on stage.
DI is great too, no complaints from sound techs, ground lift has helped me more than once, and there's pre/post EQ settings, great for recording!