Hey guys I have the G401b gyro from DX on my Frankenstein HK-450 got a Little video of it in action with the Hyperion DS-12GCP servo (.06 speed @6v .08 @ 4.8v) from AlleRC.com... Its a little bigger than the hyperion DS-09 but it also has more torque and can handle more volts (6v vs the 5.5v from the sub-micro DS-09)... They cost the same and I think the DS-12 is more suited for a 450 size heli, its actually a heli tail servo...

I also have the G401b from XMseller, they work the same...

OH yeah, I also tried the GWS HPX Park F servo and even though its analog its a good budget tail servo for someone who is starting and is only doing hovering flips and circuits, I didn't do any super 3d with it (I've only been flying helis for 2 months!)

http://www.youtube.com/watch?v=SkxMReap2HU