I’m a fan of the Logitech Trackman mice and have been for years. These have been the most sensible solution to cluttered or limited spaces where moving a mouse around just isn’t practical. But after heavy/long-term use, it seems inevitable the index finger button will start malfunctioning. It seems to start randomly double-clicking when single clicking or begin to work in other similarly strange ways. The unfortunate thing is these aren’t the cheapest mice either, usually starting at around $30 – $40 each.