Been to the store and seen these in person, even tried one on. (I normally dive with a Mares Vector 1000 AT, for comparison). I'd be in an XL (6' 1.5", about 240# right now).
I did get the impression that the nylon was a bit thinner than what is on my Mares, and it was a bit lacking in a lot of back padding, but *so what?* It's not like you really need thick plush padding and 90 billion # denier to prevent wear...so many BCs are overdone on material these days (uh oh...perfect entrance for all the BP/W rants <ducks>). The weight release was simple but seemed like it would be effective, with roomy pockets. I thought the movable trim pockets were a nice touch too. The storage pockets were big and I think there was even a pocket in the cummerbund(?) not that you'd use it for diving, but nice place to stow your c-card if you have the underwater-tag sealed kind, or a DAN card, etc.). Dual tank straps and dual waist straps were also both nice. It looks kind of 'cluttered' in the online picture but the feel with it on was fairly open in front, certainly from the rib cage up. The storage pockets might be a bit far back for comfort on some people, but then I think that about the Vector too with the way the zipper wraps around to over the hipbone to open them. Wasn't much by way of mesh to shed water, but again, that's a nice to have not have to have (I do think the pockets had drainage grommets, but don't remember perfectly).
I have to admit I was kind of impressed with it overall at the price - if I was in the market for a BC, I would have seriously considered it for the price. My brother was in town (he was in the market) and almost got one, but decided not to make an impulse purchase, and since he's in the Portland area and dives with way more neoprene (if not dry) ended up electing to go back inflate. Besides he wants to go SS backplate (again, to counteract all the neoprene) and when we kind of 'dissected' one it didn't look like its included tank support could be swapped out.
I don't know how long ST has had these excess BCs on hand (sure they can chime in) but I know I've seen it on their website for something like the last year. I guess 500 is a LOT to get rid of for a semi 'no-name' BC. Not saying that to knock it. Again, I didn't get to dive it but from a casual try it on and play with all the zippers type of exposure, my reaction was favorable.