Osprey21,

I recently took the leap and did the HH upgrade to my Axe CP with the GY-240 and using the ElectriFly C-12 ESC for the tail. Have not yet, but am looking forward to, dumping the 3-in-1 board for a "GWS ICS-480 ESC".

I am using the stock battery and have not, yet, had a drop-out problem with the tail motor and the C-12, but the gy-240 does seem to suck a little more power and the tail motor runs longer. What I experience is drop out of the main motor as bat loses volts (tail slows down, but keeps spinning). The motor doesn't stop, just kinda sputters and slows down. If I back off of the Collective/Thrust a little, I can regain enough control to get back on mother earth without slamming too hard. Maybe if I would put a LiPo in I woulf get better main moto performance, but I expect I would also start having tail motor dropouts too.

I would like to hear how the evo-20 works out. I have a feeling that I'll be, eventually, going that way, along with the ICS-480 (or similar) for the main motor.

Hope my input helps convince you to go with a HH setup. I'm an old codger and the HH has been a world of help. It aint the answer to everything, but it sure gives you a lot less to have to concentrate on..
good luck