I think there's more than just the velvet. It might be a little tricky, but you could always apply velvet yourself for less than $40 bucks in velvet. The more expensive one has a bevel that lays flat to the screen material and will not cast any shadows, as karlsch referenced for the Da-Snap. The slightly wider velvet gives you more room for overscan, and may absorb it better than the powder coat finish. That's the only thing I can think of for improving picture quality is if the overscan reflects off the finish more than velvet. It would be more noticeable in a light controlled environment. Anyway, I think the $300 extra is a little more than just velvet. As Brian B said, if you went through the trouble of making your room light controlled, you'd hate to be thwarted by unexpected shadows or a frame that brightens up. Just my two cents, good luck!