How secure? Biometric & TrueCrypt Questions

Does anyone have any experience with any of the biometric (i.g. fingerprint scan) USB flash drives such as the "San Disk Cruzer Profile" and "Lexar JumpDrive TouchGaurd"? How well do they prevent access to the drive if a user is not authenticated? Is the U3 "Logon" security reliable or can it be bypassed without much effort? I would like to carry my USB flash drive around on my key chain knowing that if it is lost or stolen that my information will be secure from most everybody, save the NSA or FBI (I assume they could crack most anything).

I know others have mentioned using TrueCrypt to encrypt volumes on the flash drive, but does TrueCrypt, having to have "admin rights", cause any problems when using machines where admin access is not possible (e.g. library terminals, internet cafes, etc...).

Thanks for any replies!

- Derek