As someone who has tried both chambers through and through, I would recommend against it. For two reasons:
-They are harder to tune right. Every time you take the gun apart to clean you have to redo this process. The dual arm setup is trickier to adjust. Now, a double arm setup can work (and I actually kinda like them even if they are harder to adjust :hehe

but there's a really big reason to stay clear of this chamber:
-They use AEG buckings, which have inferior airseal. You just aren't going to manage 100% on an AEG bucking, whereas it's easy with a VSR bucking. VSR buckings are also simply more accurate than AEG buckings. And yes, you could do an R-hop and get the same degree of accuracy but you'll always have inferior airseal.
"Downgrading", as Oddsyns puts it, is indeed the right word. The posts you read were all made before the AA chamber was released, back when the options were basically PDI or tuning the stock chamber. With the AA chamber around, there's just no comparison :shrug:
PDI does everything better than AA (in my opinion) with the sole exception being the chamber :hehe: