None, it can't be compared to anything except the Q loader, which has way too many drawbacks to even be considered
WGP Orracle w/ White Delrin Jam Bolt, Kapp Detent, Kapp Beaver tail, Kapp Cocking Rod, Low Riding Reg, Dye Pressure Gauge
Egg II w/ Warp
47/3000 Crossfire Tank
Moves your hopper away from the top (duh), feeds very quickly
Kinda side heavy (you are a pansy if you care tho)
Wow, I just got back from playing my first day with a warp and all I can say is Awesome! A warped cocker is the sweetest thing I'll ever shoot. I did a couple custom mods to bring the weight down (I connected the batteries from the warp to the egg, so I can put batteries in either and it works for both) and to make the warp shoot on every trigger pull (custom switch job for my orracle). I was shooting what I believed to be better players right off the bat, they didn't see me coming since my hopper wasn't sitting half way out of the bunker. Instead of seeing a hopper to aim at, they saw paint flying at them. Very, very fun! Even my DAD saw the advantages to a warp feed, and is considering getting one. These things rule, I can't say enough good stuff about them. Good construction (although the battery connector has been known to break, I resoldered all of the connections when I did the 12v and the battery connection mod) and great idea. I'm just surprised more people don't use these!
Just get one! It probably helps to get one while you are still getting into paintball, as you don't have any habits to break from the old hopper style.