Have used Office 2007 for a while now. I must say it took a month or so to get used it. It is much more powerful than its predecessors, I am probably only using a 10th of all its capability. But who who actually ever gets to use all it potential?
So far so good, I am happy with the product. It came preinstalled as a trial version, and the medialess licences that I purchased at the same time as new PCs, were simple to use and activate. And if you are the paranoid type, you can order the cd from Microsoft by follwing the instructions ont he licence key. Costs around £12, depending on where you live.