Same for me, although personally I'd prefer a mouse over thumb-wheel. I've been using various versions of the Kensington Expert line for the past 20 years. I a

Same for me, although personally I'd prefer a mouse over thumb-wheel. I've been using various versions of the Kensington Expert line for the past 20 years. I am on #3 and #4 now (one for home, one for the office). Unfortunately there aren't many good alternatives in this form factor, the X-keys one is probably closest. I am happy with the Experts for the most part just wish there was more competition.