16 years on TB, but only now plugging into this thread. Big combo fan, here. Saw a lot of urban bassists make good use of combos in my trombone years, and also digging the functionality in multi-band load-in high-theft situations.
In particular, I dig the great products from the late, lamented Genz Benz. Over the last 6-7 years, my most useful unit has been the GB Shuttle 6.2 1-12" speaker, but with a Shuttle 9.2 in the saddle - gotta be careful about volume abuse, but it sounds great, especially when I have the extension 1-12" on tap. Over many years, huge functionality from the GB 3.0T-10-T, and I also have the 8-T speaker cabinet, which is surprisingly capable on 5-string, so long as you do not expect volume miracles. And in a remote location where I sometimes jam or gig, the GB Contour 500, with a 1-15. Have done small/medium bar gigs, with no FOH, quite well in an outlaw country context with this unit...which could have been the B-15/B-100/Peavy whatever/Roland Cube 60 Monster Combo of its time, had Fender not pulled the plug on GB.
I'm not entirely in combo-land due to love for Audiokinesis cabinets...but I might be nuts, because a good 12" combo, with a good 12" extension, could cover all that I do. And I have huge admiration for the GB Neox 400, and the Eden Time Traveller combos, as pathways to that particular goal. Yo, Mesa: ever consider pairing a a Subway 800WD with a 12" combo cabinet, with extension? Also curious to see what comes of the GK Legacy line, in this regard.