On my MacBook I have been using Open Office for some time, and love it. It does everything I need it to do, and works exactly the way I always used Office 2003 on my PC at work. I have not had a single problem transferring documents with PC users.
On the other hand, our iMac has Microsoft Office for Mac 2008 on it as my wife insisted that we stick to the real thing on the machine that she uses. I have to confess that I hate it!
Or at least I did until I got my new Windows 7 laptop and was forced to get my head round Office 2007 in order to get client work done. In the end you learn where things are, and my experience with Office 2007 under Windows has in turn made the Mac version easier to use, but I haven't grown to love it any more.
The main difference between the Mac and my office PC is that I spend a large proportion of my working day in Outlook. I even have web-based applications running within Outlook so I don't have to leave it. As far as I'm concerned, you can give me Quattro Pro (or even Multiplan) and WordPerfect any time and I won't complain - but don't touch Outlook. And don't try to tell me that Entourage is the Mac's answer to Outlook. I can't even get it to collect email!
I'm a partner with Burton Sweet, chartered accountants & business advisers, and run the Shepton Mallet office down in beautiful Somerset. Despite the name, Shepton Mallet is actually the home of Glastonbury Festival! I trained in audit and corporate tax with Grant Thornton and came to my current position in 1991 via small local practices...