The "Micro Head" has been an essential part of my amp arsenal ever since I first tried the now-classic Markbass Little Mark II, 10 years ago. That amp usually sounded pretty good though it didn't quite have the "heft" of a real tube amp or my pre+power rack.
The Quilter does. I A/B'd it against the rack and actually preferred the tiny, featherweight BB800. It has 99.9% of the "heft" I get with the big rackmount power amp, with a nice musical clarity that works well on all sorts of jobs.
I like the simplicity of the EQ. (Never been much for the whole forest of knobs on any piece of gear I use.) I can cut the lows to deal with a boomy room if I need to. Otherwise, I pretty much leave it alone.
There is supposedly a sophisticated built-in compression scheme interlinked between the gain and master volumes. Some people like it with the gain cranked and the master turned down - I found that felt "squashed" and didn't really respond like the tube amps. So I leave it at a more moderate setting, starting with both knobs around noon. The gain gets adjusted for extra hot or cold instrument signals and the master goes up and down for stage volume. (I actually have the master set two notches under "noon" with a loud Salsa band playing outdoors with no PA support. This amp has plenty of power to spare!)
One thing this amp lacks is a true built-in DI. There is an XLR line out (apparently meant for "slaving" additional amps via the adjacent XLR input) that will do in a pinch. Just bear in mind that there will be no provision for lifting the ground or changing the stage volume without affecting your feed. This can be a minor thorn in my side from time to time but it hasn't prevented this little amp from becoming my go-to workhorse for micro-head duty and for larger, louder gigs. I've been using mine for a year now without any technical problems, whatsoever.
Quilter Bass Block 800