I gigged as a bassist for a while and my rig was a Mark Bass Little Tube 800 head with a couple of different sized cabs, depending on venue - 1x12, 2x10, 1x15. The first thing I learned was that 800 watts of Class D was NOT 800 watts of SS like I thought it was. That amp was ALWAYS too loud. Next, I learned it was clean, clean, and ONLY clean. Even with the tube engaged the amount of grit available was minimal. I also learned that the amp should have been designed with a limiter built in. It would have helped. While I really dug the tone, I was happy to dump that rig.
For reference, I use a Masterbuilt Warwick Corvette FNA Jazzman.
These days, I use the Helix with a PA wedge for any bass gigs I would need. Surprisingly, people are digging that rig WAY more than the Mark Bass. I have a bank that is nothing but bass rigs. All the classics are there, straight-up with no effects, then I have "my" tones which then to be based on two amp rigs with a few effects included. Nothing crazy, but I do like modulations with bass. I have a few rigs set-up where I am running clean, dry amps parallel with distorted, effect laden "freak-out" rigs. It's cool.