Hey Bret...
I got one of these during a giveaway that Castle Creations did at NEAT fair this year. I've put it in my Funtana 90 to replace the NiMH Receiver pack that I had in there.
My Funtana has some serious overkill servos in it... Five Hitec 5955's... Hey... I needed new servos for it, and they were on sale.
I'm powering the Funtana on 10S lipos... I have a 4S and a 6S in the plane in series. The CastleBec taps off the 4S pack. The CastleBEC is set for 6V.
Anyways... last weekend it worked great... 5 Flights of Bevel to bevel 3D, and no problems from the Castle BEC.
The best part is, I now only have one battery pack to charge to fly the plane

. Now I'm trying to figure out why I'm not going 2cell lipo with this regulator in my 50cc for next season.
Cheers!
Tom