I heard the VMAX does what it is designed to do, it feeds paint fast. There are a few people who say the battery is **** and won't make it to a 3rd case, and with two 9v batteries it can get expensive.
Of course the paintball community knows the halo very well, and there are a lot more faults with the halo than the VMAX, we are just used to the halo. Thousands of players are still using them(including yours truly).
Quality is less quantity. The Rotor may seem an expensive proposition right now, however, once you get it you won't need another hopper for a really long time. The rotor is pretty much bullet proof(I think there is a video of a guy shooting one with a 12 gauge shotgun). It feeds reliably, and will run forever on 3 AA batteries.
The rotor is worth every penny and if you want a hopper that "won't break the bank" then a rotor is your best option.