Being used to single stacks for many many years it does bug me slightly that the double stacks rattle.
Not all of them but several do.
The only other issue I have with my CZ's is.............when I slam a mag home in the gun 95% of the time the slide will go into battery. If I just "Put" a mag in them all is well. But again, transitional 1911 guy here so slamming a mag home is muscle memory/habit and hard to break. Scares the poopy out of me when they do this.
Just a time saving device.