The only major difference is that the updated boxes MIGHT curve around the spare tire a little more than the old ones. Otherwise they'll be functionally the same, except these will actually have the connector cups included, which mine did not.
I'm not actually sure if there's a disadvantage to the type of box you're talking about, but I know if you have a factory six-disc CD changer, it would be in the way. It's also REALLY hard to mount subs in that style box with enough volume or depth. Then you get the people like me who also put their toolbox there, where they don't interere with the trunk space. Those behind the seat boxes are good for a pair of 8s, or a 10. But the 12s are a little much.
I've considered making those as well, but they weren't that great of quality back then either. I'd have to do more research about those. Also, they interfere with rear strut bars and possibly the sunroof holders.
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