Does anybody used it on a long period of time?
For us, we had from the start a problem with the slip ring.
All electrical cable were severed and it was found during a basic inspection.
A new version was tried a few months later, but the same problem was found.
Since the slip ring has to be replaced after 400 hours, they decided to remove all of them. Since then, it looks like there is no real goal to use it?..???
So, we never used it in reality and we don't know if it works or not.