no matter what it's still metal. the innards of a watch are metal and by putting them in a winder you're stressing all those metal parts. a BMW car that cost 150K still need to be repaired if you use it everyday and reaches a certain hundreds of thousands of miles but when you store it in the garage (no stress on the engine) it will go longer...... I'd rather save the money for the winder towards another watch. just my 2 cents.....You can never over wound a top quality swiss automatic especially omegas or rolexes. Plus if you can purchase a 5k up watches what is a couple hundred for a winder....