Encrypted vs non-encrypted; which to use?

Just wondering which is the "better" choice when adding new Z-wave devices, encrypted or non-encrypted. I recently installed a couple of locks and a garage door opener and used encrypted on them as it appeared to be necessary for Indigo to see all the available features.

I've also got a bunch of multi-sensors that I included without encryption and they seem to function just fine. Would there be any advantage to switching them to encrypted? Can that actually be done with multi sensors?

[matt (support)]

Not all modules support encryption but all of the Gen5 (newer) ones do. That said, we recommend only using encryption for modules where you feel it is useful/needed. Locks and garage control would be a must, lighting/appliance I would skip it, and for motion and door/window sensors I don't have a clear recommendation.

The disadvantage of encryption is that it is slower and causes significantly more Z-Wave commands to be sent. This will decrease battery life and increase the odds of collisions/congestion on the network. The advantage of encryption is, of course, that it is encrypted and will prevent both snooping and spoofing of commands.