Teenage Pilot 13:

The GY204 works excellent. Had it in 10-15mph. winds and tail stayed true to its heading nomatter what direction. It is very sensitive to adjustment and takes a bit of time to get it tuned. Makes flying so much easier. Ive progressed from hovering to actual flying straight lines thanks to the GY204. I recomend it highly, it was worth every penny paid. Youll need the ElectriFly C-12 part #GPMM2015 (If your running the stock receiver and gyro) to make the GY204 work.
Problem, I now want the brushless motors, the ElectriFly C-12 doesnt support them. I can probably go to brushless on the main motor, but not the tail motor. I will have to check into it further.
I purchased all of my Rotor Head parts from http://helihobby.com they have a brushed alluminum product at a fair price. Received items in 3 days to Ca.. And purchased the Blade CP carbon fiber Blades at my local hobby store for $29. these things are nearly indestructable. Hope that helps