Miche makes a very nice tool that goes with the system to tighten both carrier and lockring. Super easy to use, never slips, cheap and eliminates all other nonsense.

I have a Miche cog on one bike, Campy on another, Phil on a 3rd, and DA on the 4th. When properly aligned, the Miche is as silent and reliable as any of the others have been, which is to say flawless. Changing Miche cogs with the Miche tool is so easy and fast, though. Take your pick of cogs. I personally have no preference among them. They all work reliably when installed correctly.