I got the PPS-4d and have it set up in heli mode using a Futaba 8UHS. The jury is still out on it, I need to replace the ESC with a better one. A 12A was recommended, using an ElectriFly Silver Series, but the set up pulls a little more than 12A at full throttle with no servo loads. I'm getting a Castle Creations Phoenix from
www.b-p-p.com with the 3A BEC to put on it, that should help. I haven't been able to get more than about half a pack through it before the ESC shuts the motor down.
I'm thinking of getting the GP unit for a Turmoil as well. Let me know how your set up works out.
-Greg