Brushless stabilser - possibly for Ricoh Theta M15

I'm looking at 360' filming with a Richo Theta M15, stabilsed to reduce viewer nausea. 

Feiyu FY-G3 Ultra

Here's an excellent unboxing video of the camera, with a goPro mount.

https://www.youtube.com/watch?v=WDwRUkjSPZU

Here's his blog on the device, having used it a bit:
http://www.rcgroups.com/forums/showthread.php?t=2184744

Here's a motorcyclist's video on how to attach it to a helmet using goPro mounts, which it's usefully compatible with:
https://youtu.be/VjK-asaqDMU?t=4m12s

Apart from the charging issues (you can only charge 2 batteries at a time and it takes three) it's available for a Not Cheap, but not insanely expensive £183 at Amazon UK here:

http://www.amazon.co.uk/Newest-3-Axis-Handle-Brushless-Steady-G3-3-Axis-Gimbal/dp/B00LJNLZOW/ref=pd_sim_sbs_23_1?ie=UTF8&refRID=1FZNKAX5E4V8G7VJNB24