I hated my Evolution. The door would always stick, so I had to loosen the screws just to open it. The shells would crack and the feedneck wouldn't fit in most of my feednecks causing me to have to sand it down. Plus it pushed all the weight to the back of the gun. I loved my Halo Too, fed faster, stronger shells, easy to open door and never had to sand the feedneck.
As for the new Revi, it's a CAT (Continuous Agitating Technology) and is on sale at ANSGear.com for 12.95. I prefer the old Revi's with the eyes.