Oscillot cat fence?

Has anyone heard of or tried this system? It basically a roller that attaches to the top of the fence and prevents that cat getting a grip on the top. My daughter is looking for something to keep her cats int he garden when she moves to her new job in January. She will be living in a staff house on campus and is very limited in the modifications she can make to the existing wooden fence. The company are based in Australia and I don't know if they operate elsewhere. Fun video, though!

http://oscillot.com.au/_mgxroot/page_thank_you.html

That's something I've never heard of, but it looks really neat. I suppose it would work provided the fence were high enough, but perhaps not for very determined cats.

It's fine for most cats, I do know some Ocicats that outsmarted it though