I find it extremely easy and so far it is only 1x occurred that has come loose in his pocket a key by itself. However, since really need some factors come together that something comes up.
It is very convenient that the rings are individually mounted to rotate freely. So wurschtelt you do not always with the entire federal government around when you turn a key in the lock!
What bothers me a lot that with 5 or 6 rings relatively few are included and you can always order a new covenant must if more is needed.
It comes already times something together:
Flat key + postbox
Key to the house + garage + postbox
Bicycle lock (mine + reserve for my girlfriend)
2 office Key + rack
Key to my parents' house
Scooter Key
Car keys
Leatherman Micra
Sheep trailer
Unnecessary key always get there Schlüsselboard (eg office key on vacation).