WEP can be cracked quite easily.
WPA/WPA2 are virtually uncrackable short of brute force (which would take on the order of millions of years). So use a good passphrase.
Originally Posted by
LIH Prem
Keeping it open just exposes yourself to unnecessary risk. But most of the methods can be easily cracked, unless you are using the latest and greatest one. Even that one can be cracked, just not as easily.
I would enable it.
-David