Hey again,
Overall, I'm very pleased. The rehearsal was at a local church where I normally run a SansAmp Bass Driver pedal into the board. The Markbass improved pretty much every aspect of my bass, including:
- No more hiss/noise coming through the monitors. I'm not sure why my SansAmp ever put out any kind of hiss or noise, especially since I bypass the majority of it, but the Markbass' line out was SILENT...I mean, absolutely no noticeable noise whatsoever.
- Clean tone. There was loads of low end from both the line out and the combo, and all of it was extremely punchy and clear.
- Projection. It definitely helps that the combo is voiced toward the mids, but I never expected anything like this. The sound guy couldn't tell much difference in volume when he was on the edge of the stage and at the back of the room.
My only concern going in was the tweeter. The hiss seemed really apparent in my bedroom, but it wasn't at all noticeable on stage.
So far, it's exceeded my expectations. It will definitely be at this church every Sunday. I have a few mid-sized gigs coming up with no PA, but I think this will be fine. I was able to use it as a stage monitor with the volume just a hair past one, so it should be a piece of cake accompanying a Fender Acoustasonic Jr. and a drum set.
Thanks for your opinions! You really helped out...especially the amazing pics of Slaine01's rig.

I'll just need to be extra careful so nothing goes wrong internally.