Oh, and con, about using alternatives to MS Office, I've been using the iWorks set which came with my MacBook. I've had no problem converting my Word Docs within the Pages program of iWorks, nor my many PowerPoints in the Keynote program (which is actually uch slicker than PowerPoint). Also the Numbers spreadsheet has seamlessly, more or less, converted my Excel gradebooks. The formats changed a bit, but no data (i.e. grades, student info, etc.) lost.
And the guy at the "authorized" Apple Shop near my home was kind enough to slip in a disk, punch some keys, and voila my trial version became a registered version. He did it for free (although I had just bought a DIV cord from him to connect the MacBook to the projectors in my classrooms).