I migrated my site to Google apps premier edition. Let me just say that the transition was less than smooth. They have tools intended to move exchange mailboxes to their infrastructure and after 5 hours I was left scratching my head. Perhaps it was an issue with GoDaddy or user error but there was no real documentation and it left a bad taste in my mouth. I have downgraded to the standard free version and it is better. I went from 200 per year for hosting and email to free per year with more features. Gotta love it.