Your wrong there mate, most freewheels have their lockrings positioned against the crank arm - so they actually can not undo when fitted to the bike. ACS Claws don't have this feature though! Also the ACS have very few engagements compared with freewheels such as Try-all, Eno, Tensile, Monty, Etc.. which all have between 60 and 108 engagments, where ACS Claws have around 36? Which changes the ride of the bike for the worse.