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Do you use Filevault? If so, why or why not?

Depends on the machine and OS. On machines which support AES-NI (Sandy Bridge and newer) you should use FileVault. On all other machines AES-128 encrypted sparse disk images (create them with Disk Utility) are the better choice. AES-256 is much slower, and easier to crack than AES-128.

Bruce Schneier in Comments of Another New AES Attack said:
That being said, the key schedule for AES-256 is very poor. I would recommend that people use AES-128 and not AES-256.

http://www.schneier.com/blog/archives/2009/07/another_new_aes.html
 
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