I am stuck in front of a PC 48 hours per week - I find it great for zooming through Excel spreadsheets, SQL Server stored procedures, ASP / VB code, and internet forums. I liked it so much, I bought a second one for home. And I realize just how much I have come to depend on the "freespin" functionality when I find myself occassionally using a public PC and I have to slowly wheel / click my way to the information I seek. $99 is a bit steep (based on the whining of my collegues) - Logitech might sell more if they can realize a $59 price point.