Here is one of my Mesa 810 cabs. I did them all in crazy colors.
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In all honesty, if you can find one, I would find a Peavey VB-810 cab. You can find them used for a few hundred bucks. They are a true old-school cabinet, loud as hell, and built like a beast. They are the last USA-made Peavey cabinets, and owning both, the Peavey is honestly built better than the Mesa cabs I own. I know some people won't believe that, but the Peavey uses cast-frame Eminence USA drivers, and each screw is held by a T-nut where the Mesa cab uses cheaper stamped drivers, and plain wood screws screwed directly into the wood (no T-nuts) with no regard to whether the screwholes are lined up with each other speaker. It's like they sat the speaker anywhere on the hole and immediately screwed it down. When two speakers are next to each other, all the screws are inserted at random locations. You don't really see it without a grill, but I was surprised to see such cost-cutting and time-saving production methods. I also had to have Mesa remake two of my grills as the grill material was pretty badly crooked; I was surprisingly given the explanation that it was designed to "look good at 30 feet, not 3 feet" until I went up the chain to get someone to address the problem. They then remade them perfectly as they have some great guys working in the actual shop; the ones who actually build the stuff are true craftsmen.
The Peavey uses a higher gage wire, heavier more extensive bracing, and is a sealed 4 chamber cabinet with ample insulation stapled to the walls of every chamber; the Mesas have insulation, but it isn't secured like the Peavey. The Peavey is a bit lighter overall, and covered in durable bedliner (not as fancy as the Mesa vinyl for sure but still looks great, and more workmanlike). The Peavey is a bit more aggressive in the midrange, but the overall efficiency is about the same as the Mesa, and surprisingly close in overall tone, with a nudge going to the Peavey since the Peavey's grill is more transparent than the thicker Mesa grill material which filters out some of the upper mid aggressiveness. Also, the Peavey has provisions for running it in stereo where the Mesa stupidly just has one input.
I love my Mesa cabs, but I'm just being honest in my review. The Peavey is the old-school vibe of the old Mesa cabinets at a fraction of the cost, all the tone, and none of the bloom.