RollyBrush – Does anyone know if / how well it works?

I’ve seen things like this in dispensing machines in motorway service stations and treated them with suspicion – but  then I was slow to take interproximal brushes on board being a “floss is the only thing that works” man. So when I saw this on Marty Jablow’s blog I was interested.

If you’ve tried it let me know what you think.