Hi Dennis, I have been using it on numerous computers since it came out, and (knock wood) haven't had any issues. One caveat though... File Vault does a kind of "housekeeping" function when you Restart or Shut Down your computer to reclaim the disk space that has been lost to the trash. If you keep your computer up for long stretches or if you trash a lot of files, you will feel your hard drive is filling up too fast because until you Restart or Shut Down that disk space is part of the vault. Good luck, and so long for now, TOM >I'm seeking advice on implementing File Vault on my account on my >Aluminum PowerBook G4 (OSX 10.4.6). I'm concerned about reliability >and performance. Those of you who may travel more, what >recommendations do you have and what kind of practices do you >recommend with File Vault?