Halo fast as you need, on the downside reliability, if you get a good one they're great if you get a bad one......
Odyysee customer service generally good but a pain in the arse to get parts for, really slow as well in my experience. Lot's of places do stock parts though but they do run out....
Really like the balance of the halo, the weight is in the front of the hopper which counteracts the weight of your bottle quite nicely.
Egg, fast enough and very reliable, personally I hate the shape and not as easy to dump a pot into in my opinion. Battery cover is rubbish even after bending the battery contacts in. good back up hopper but nowhere near as fast as the halo.
Warp YAK! used it for a couple of training sessions and half a tourny, encourages bad gun skills (no left hand shooting). It's another thing to go wrong and adds alot of weight to your setup. Also how many pro's use warps??...
Paul.