I have Google Apps Free for my personal domain and I am considering moving to the paid one, just to be able to phone them if anything ever goes wrong. (The Android remote-wipe feature that comes with it might be worthwhile too, just-in-case.)

I also primarily use an IMAP client which saves a local copy of all my email, so although the "identity" issues (and non-email data) bother me a bit, I do have at all times essentially a backup of all my mail.