FileVault for Mountain Lion on a Desktop (not laptop)

Hi:
Any advice on these queries regarding FileVault would be greatly appreciated:
1) Most generally, what are the disadvantages of the new version of FileVault for encrypting a desktop computer? It seems like in the old days this was frowned upon due to bugs, but is this still true with the new version of FileVault? We have lots of confidential information on our work desktops. Occasionally computers break and must go out to be fixed. It would be great to have all the data strongly protected.
2) If one were to encrypt a desktop with FileVault, would it still work with an encrypted Time Machine backup? Are there any problems we should know about when backing up when Filevault is enabled using Time Machine?
3) If one has a weak password for a Guest account and a strong password for your own account, and the entire desktop machine is encrypted with FileVault, is there any way someone could use the weak password on the Guest account to access the data on the account with the strong password?
Thank you very much!
PS All of this applies to OS 10.8.2

The answer you accepted as a solution is absolutely false. Not only do you not need to purchase ML, but the App Store version will not install on your computer.
There is no need for you to create a standalone installer. In the very unlikely event that you ever need to reinstall the OS, you can do it by booting into Recovery or Internet Recovery.
OS X: About OS X Recovery
If you insist on creating a standalone installer anyway, follow these instructions:
Create a bootable Lion install drive for newer Macs
The instructions are outdated, but should still work.

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    Identifier:      com.apple.Safari
    Version:         5.0.5 (6533.21.1)
    Build Info:      WebBrowser-75332101~7
    Code Type:       X86-64 (Native)
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    User ID:         501
    Date/Time:       2012-07-27 08:15:08.202 -0700
    OS Version:      Mac OS X 10.8 (12A269)
    Report Version:  10
    Interval Since Last Report:          1612 sec
    Crashes Since Last Report:           24
    Per-App Crashes Since Last Report:   5
    Anonymous UUID:                      CD2550E7-CA89-438D-A184-2D3C68F75800
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    Message was edited by: varjak paw

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