I hope Scrod won't mind if I chime in here, but I've also been using the Miche carrier system w/o any problems. I just have one caveat, and that it is very important to get the carrier tight enough that it cannot unscrew under any circumstances and becomes a permanent part of the hub. The sole purpose of the lockring should be to keep the cog from slipping off the carrier and nothing more. To this end I've used red loctite on the carrier and tightened it on the bike by standing on the forward pedal with the front wheel pressed against a wall. So, you shouldn't use this system if you plan in the future to use your hub with a conventional threaded cog.