There is no advantage for you to “upgrade”other than a lighter and thinner wallet. I have a pair of MR22 1st stages Circa 2000/2001 and Abyss 2nds with the turbo cover that dive absolutely fine, no reason at all to change them.
A slight dent to the metal body of the abyss 2nd stage is not a problem unless it affects the function of the internal parts…If you still have it and are not interested in seeing if it can be put back into use I would be willing to take a crack at it.
The nomenclature 82X refers to the 1st stage. It is typically paired with a Mares Epic 2nd stage which is a metal body, pneumatically balanced, adjustable 2nd stage. While it is a bit more Gucci than the older Abyss 2nd stage it replaced, I don’t believe the benefits offered outweigh the cost compared to the simple workhorse performance of the Abyss 2nd stage.
If you do decide to upgrade, I would be interested in your current gear so shoot me a message if/when the time comes and you are interested in selling what you currently have.
Cheers,
-Z