I don't use it but a couple of things to keep in mind:
1) Be careful entering your password. If it is all numbers make
sure you hold the ALT key for each or your password 1234 will
actually be 1ers.
2) If you or someone else enters the password incorrectly the
preset number of times the phone will wipe the data stored in
Password Keeper. The rest of the phone will be fine.
It works nice, but I purchased DataVault and really like how it will sync up with the desktop application so I only have to remember one password to safely store all my info either on my laptop or phone and they stay sync'ed.
Posted from my CrackBerry at wapforums.crackberry.com