Considering I've got both, used both, plus I might have had a hand in the WPG hopper tests
I'm afraid many of you are missing the point.
The Evo is not a true force feed hopper, it does NOT apply any constant pressure to the ball stack, yes it does "fling" the paint into the feed tube, but that only helps if the paint is not held up (like a closed breech does).
So at the point you take the first shot of an egg (use an electro cocker for example), the bolt cycles for 1/nth of a sec were n is the preset max bps. the second ball in the stack of an egg is NOT under pressure, so it only falls under gravity (roughly equiv to 13bps). the second ball is not under pressure until the egg reacts to the gap in the stack caused by the first shot and spins the motor, then you have to wait for the stack to catch up before you are applying max pressure and actually feeding at top rate.
This means an Egg on a closed bolt gun will not/can not and wont give you great feed rate in short burst, and wont kep up with a closed bolt gun with max bps set too high if you can shoot faster than about 12/13bps.
Plus, when you start getting the physics of the balls stopping in the breech (ask Manike) the actual feed rate is even slower.
The Halo keeps the ball stack under constant pressure, and means that it basically cannot be outshot with a legal trigger, even on a closed bolt gun with low cycle times.
I agree that the Egg is great value (hence the award in WPG) but time has shown the quality is up to BE's usual standards
plus it actually isn't as fast as people make it out to be.
The Egg is good, but it isn't on a par with the HALO.
Peace out