Does anyone have any experience with these? If so, could you please provide sample footage?
Haven't had practical experience with it but I did see it up close at this very store* a couple of weeks ago. It is certainly made well enough but it is not intended to be anything more than a holder for the GoPro. The Tilt and Roll functions work in so far as they move the camera in the two axes. However, you can not expect such a rudimentary assembly to create cinematic magic.
Price is good for what you get but you may well regret the GoPro only limitation.
The US Forestry department was just taking delivery of two SJ-800's, both equipped with these little GoPro gimbals, with the intention of using them for surveillance and sniffing out fires etc. with programmed waypoint flights. Good idea and good business for Atlanta Hobby but almost certainly doomed to being a waste of tax payer money.
* the same store that saved by buddy and I a collective $15,000 with a timely demonstration of the SJ-800 Flip Of Death.