I did the HH Gyro install the CPV3 manual suggested. Only I used a $44 Telebee HH gyro instead of the $130 Futaba. The telebee works flawless. You don't have to constantly worry about doing the tail work yourself except for when you need to. For the Tail ESC I used the Electrifly C12 like in the manual. Now with the telebee gyro, I had to extend the ESC J connector wire all the way back to the gyro. As for arming the ESC every pack it only takes like 10 seconds to do it after hooking the pack up. I plug the pack in and wait a few seconds for the gyro to power up, then move the stick full right rudder and wait a sec for a beep, move the stick full left rudder and it'll beep and you're good to go. It takes longer to put the canopy on than it does to arm the tail ESC.

Also for the HH gyro install per the manual method, you'll need a soldering iron and solder to solder the power wires on the tail ESC to your helis male deans connector.

To me it made a huge difference in flying. I was struggling with side in and nose in hovering just because I'd get mixed up on which way the tail needed to go since in stock form they like to drift around alot. With the HH gyro I could pretty much immediately to side ins and nose ins with ease.