I guess I've just been behind the times, but I've never had an incentive to switch. I just installed faugus and transferred everything over and it seems very slick. It seems to be missing 1 or 2 things, like environment variables per-game, but all the other important stuff seems to be here. I know what I'm doing with prefixes so having all the knobs to turn is great, but honestly linux gaming does not need most of those knobs nowadays.