bit of both really, I have a box full of standard double mag pouches and I find they're just a bit bulkier than I wanted since I only ever run one mag in each anyway. I have loads and loads of shingle type open top pouches too which while less bulky don't have lids and I like having lids to keep everything nice and protected. I can't foresee any situation in airsoft where I'll need all 6 spare mags I carry RIGHT NOW!!!! the three that live in the kangaroo pouch are rapid access enough!
As for buying eagle stuff, if I had the money I would, but because they don't really *do* stuff for the civilian market it's almost all surplus SOCOM gear which carries a mega price premium just because someone may have been using it while they killed other people.
Also, how do you find the PTS PMag style mags for recoil shock guns? I'm tempted to panic buy a few but I'm not sure!