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@M_V
No experience of the Sugino ones but the Miche version is shit.
The cog always has a bit of play on the holder which allows the lockring to work loose very quickly.
The whole concept is, imo, utterly flawed. They are sold as providing a faster way for trackies to change gearing but they require the use of a lockring. Most trackies who change gear regularly don't use a lockring so there is (at best) no benefit.
Also worth noting is that the Sugino cogs are alloy. Might be alright in the sterile environment of a velodrome but on the road, with grit and spray and salt etc contaminating your drivetrain?