A positive review from Thurrott, who calls the suite of apps for iPad “the real deal”. He also makes a good point on the decision of allowing users to view documents for free:

Once you get past the weirdness of Office even being on the iPad, it sort of settles in. Yes, it’s here. Yes, it works as expected. But … why bother? Why even release such a product? Obviously, the success of the iPad and similar Android-based tablets—and their use as productivity devices in some cases—warrants the release. But it’s more than that. Users of the iPad get built-in viewers for Office documents, and they’re lousy. They don’t show the correct formatting on anything but the simplest documents, making it hard for users to move documents back and forth between a PC and the device.

iPad users also have their choice of Office-like apps such as Apple’s iWork applications and various third party apps. These apps let you open and edit Office documents, but they also screw up the formatting fidelity of those documents. So if you’re trying to integrate your iPad into your workflow you may end up screwing up those documents, not just for yourself but for others. Only Office treats Office documents correctly.

Look no further than Apple’s Top Productivity charts to understand why Microsoft is calling them “the real Microsoft Office apps for iPad”.