Richard, I didn't have any problems at all installing Office 2007. You can have your 2002 and 2007 together on the same PC if you'd like (just pick a different install folder).

To date I haven't found a single one of my spreadsheets that doesn't work in 2007, so I'm very happy with it. Like I said in the video, there really isn't anything EARTH SHAKING that you have to get that's in Excel 2007, except once you get used to it, the Ribbon really does make working in Excel easier (I was resistant at first). Plus, if you like making PRETTY charts and use a lot of images, that has really been enhanced.