The biggest thing I didn't like about the Tanaka rounds was the fiddly o-ring. The Evo rounds made this issue much, much better. Tons better.
I think the Evo2 rounds are anodized aluminum instead of brass? Is that right Claymore?
Anyway, if you haven't tried the C-Tec 9mm mild kick anodized aluminum rounds, I'd recommend giving them a try. I've used them in my Tanaka 9mm models and MGC 9mm models and I really like them. They are 7mm cap carts so no issues with fiddly 5mm o-rings, plus since they are the anodized aluminum, they clean up much easier than their brass brothers. Compared to the Tanaka Evo2 rounds, there are less parts to mess with. Side benefits include that they are supposed to be easier on the guns (I do think they are) and that they eject really well due to the lighter aluminum construction.