Emm, just order a r4 from gameyeeeah, i also like to play gba games, it's great to know more about that.
The EZ4 is almost like a redundant device to the R4 because it can play DS games too. I want something that would only play GBA games and thus, possibly be cheaper due to that limitation.
yes, gba works fine from slot-2 with no passmecan you play gba games through a slot 2 device without having some sort of passme?
if you're using the flashadvance in GBA mode, you wouldn't use the r4's passme option. That is only if you want to boot your slot 2 card in ds mode. If you boot your card like a regular gba game it should work fine, unless I misunderstood you.
My Xrom 512 works just fine on my DSLite for gba games.
As to the original topic, I have a g6 lite that i'm using almost exclusively for gba games with my m3 ds simply. Thats my solution and i love it.