I personnaly have tried alot of different mags.
Here is my review (in french sorry) on our forum:
http://www.1st-pathfinders.com/phpbb...php?f=8&t=1356
What I can say after fielding it for the first time last weekend is that some mags have feeding issues (MAG mids) maybe it was because they were new.
TM lows work good
KA lows work good
CA hicap work good
Star mag 30rnd work good
You loose about 4-5 Bbs when you take your mag out as previously mentionned. I am not 100% sure yet if long term this will be viable so dont sell off your G36 mags just yet!!
For now its nice to combine with my armalite mags.