Ricochet AK - Agitating hopper
eVlution II (Egg) - Weird shape, brittle neck, spill proof lid
Vlocity - Large mouth, short battery life
Halo B - Lots of batteries, heavy
Reloader B - Similar to Halo B, but less batteries and sound activated
I've used a lot of different loaders and the Dye Rotor is the best so far. The designers at Dye really did their homework when developing the Rotor. Loaders up until now have been vertical split shells held together with glue, screws, or bolts. The Rotor's horizontal split shell requires no tools to disassemble it, so cleaning broken paint is fast and easy. I was sold on the Rotor mainly due to its easy to clean design. The shell also appears to be made of a non-brittle plastic that flexes upon impact instead of cracking. There are no eyes, vibration/sound sensor, or flex switch to activate the loader. It just keeps a constant force on the paintballs. The on/off button is easy to use, durable, and big, but its blue light can be difficult to see in sunlight. The small windows make it hard to tell when you're almost out of paint, so I recommend getting the large capacity shell. Since it's new, the Rotor still commands a premium price. When other loaders got cheaper because of the Rotor's popularity I made the mistake of getting a Reloader B. A couple games later I went back and got the Rotor. Dye claims 50 bps and 50,000 shots (uses 3 AA batteries). I can't verify or dispute their claims, but even half of those numbers is faster than I can shoot and will save me money in batteries.
If you've ever had to sit out a game to clean out a loader, or lost a screw, or stripped plastic threads, or gotten a cracked shell, or had a loader die in the middle of a game, then get the Dye Rotor.