Here is a link to the most recent thread:
http://www.bikeforums.net/showthread...ight=miche+cog

I've used it for about a year and a half. I put around 150-200 miles a week on the bike that I have the system on, brakeless, and year round. I skid plenty, and have yet to have any issues whatsoever. If you want to have a nice mix of cogs, it ends up being cheaper in the long run.