I have used regular loader like the revolution an evolution.
RT Automag with a freak kit, lvl 10, and warp feed.
It makes your gun alot less visible and it is VERY fast.
It is very heavy but youll get over it if your not a wimp.
It is a great overall loader. I definatly would recomend buying one. If you have a mag you need to buy one because the warp bodies are really neat. i think they load about 20 shots per second. The only problem I noticed was if you have the warp on the left side of your gun it makes it really awkward to lean out the left side of a bunker or hold the gun lefthanded. The circuit boards and stuff in the inside are rather fragile too. I had a battery wire come off but I just saudered it back on.
It is a great loader and you will feel invisible if you put one of theses on your gun.