Business Computing World published a review of Google Apps Premier Edition

For small companies with limited budgets and little in the way of in-house expertise, a hosted messaging/collaboration service makes a lot of sense. Google Apps is a front runner in such situations, being quick and easy to deploy with costs that are both clear and fixed. The functionality on offer ticks the majority of the boxes, with messaging and calendaring the prime movers in this respect. Just don't expect to do away with Office and other local applications. Google Apps goes some way down that road but stops fairly short. At least for the time being.

Google Apps Premier Edition Review