I've had the Archon one for about 6 months and to be honest haven't spotted any major advantage of the platform yet over my 200 shot viewloader gravity.
Viewloader hold more balls and is easier to load, as the Archons shelf blocks balls when loading.
Archon feeds better in a drop test holding the hopper still but not noticed much difference when moving around in play. You occasionally have to shake both.
Viewloader takes Halo Speedfeeds and crowns (not a lot of people know that)
Neither of them particularly like reballs
Archon cost £15, viewloader cost £3
Neither performs as well as an old 9V agitator hopper.
I know thats a comparison between an Archon and not a Proto but they are essentially the same.
I predict you will see the proto on pumps as it looks cool and in proto starter kits but not much else. With new agitators at £20 and second hand Halos at £25 why would you use a £10 gravity feed as a backup?