I have moved from Carvin (great sound but...) to vintage Fender Bassman w/4X12 and love this Mark Bass. Its exactly what I was looking for. Expensive but worth it!
I run both a old passive Fender P-Bass and an active Gibson Les Paul bass w/each getting a different but true sound out of it. No boxes or preamps, etc. just clean solid bass.

Mark Bass STD102H Bass Cab: I have been playing bass for over 15 years with almost every kind of band (rock, soul, blues, jazz), and I've been through with dozen of different amps. A couple of months ago I went to my usual dealer and he told me he just got a new brand of amplifier, which I definitely had to try.
After a quick try, he convinced me to bring it home, so I loaded in my car a Standard 104HR cabinet with a TA503 head.
After spending about two months playing gigs four times a week, I have to say I am just disappointed with this amp. The controls suck, and the overall capability of obtaining a decent sound is poor. The sound is plain, just too average for my tastes. I will change as soon as possible, looking for a Mesa, more expensive, but a lot better sounding.

Mark Bass STD102H Bass Cab - Both the 410 and 210 were plugged whilst playing my USA Deluxe Jazz 5-string through it - when the guy told me it was just the 210 cab I bought it straight away for £499. It's massive for a 210 but still way smaller than a 410. Drivers have neodymium magnets and the cab can be easily lifted with one hand - it's just so light.

The huge rows (2 full width divided vents top and bottom) of ports blow out air like a leafblower when hitting low notes. Carpet covering is immaculate + also has a really tough kick grill, large inset handles and tweeter attenuator on the left hand side of the cab (which I thought was a blinding idea :D)

Sounds: really even frequency response - very little (if any) tonal colouration added to the signal. I run my SWR SM400 bridged (full 400watts) into it and it absolutely sings, massive lows whilst being nicely defined as well - damn loud, damn good cab - I've not got a bad word to say about it, which is a first - lovely cab - the portability of it caps it off, using this cab on its own is in no way a compromise between portability and sound quality. A 1x15 would no doubt be a good addition (the thought of that rig makes me dribble heh he) the low end would be enormous for such a small rig. Would love to get the Markbass 115!

Flawless in my opinion, and no-one else who has used when lent out has said otherwise.