I have been using those for just under 2 years. The functionality is basically the same between Microsoft Office and the iWork suite. I really do like using Pages, Numbers, and Keynote over Microsoft Office because it is much more intuitive in my opinion. It will take some time to get used to using Pages, Numbers, and Keynote, but both Office and iWork are similar enough that it shouldn't take too long. You can also export the documents you create in Pages, Numbers, and Keynote as Word, Excel, and PowerPoint documents, so you won't have to worry about compatibility errors if you send the documents to others who are using Microsoft Office.