Gearing tends to strip out, auto and manual feed not reliable always.
Review:
Overall, I enjoy this modification, It would be nice however to find replacement parts for the internals vice buying a new one. Fairly easy to install. Does have a bigger profile, the flat nose, easy to be fixed with some body putty and inginuity. I have not seen a huge increase in CO2 or Compressed air usage, I use both RT and cyclone. maybe a 500 round decrease per 20 Oz tank.
Conclusion:
I say go for it, for me maybe i have a jacked up one, But i will definetly support it!
The cyclone feed doesn't decrease your gas efficiency. It runs on excess gas that comes out of the gun. That's why you need that little hose coming out of the side of your gun.