They are difficult to use.
They give you a painful wrist.
They give you a sore finger.
They could possibly give you a guitar style callus on your favored finger.
They cause you to accidentally click links leading to the Official Dolly Parton website (
http://www.dollyparton.com/ )
They are very difficult to use with slightly damp hands.
They are responsible for making me seem a worse poker player than I usually am because of causing me to incorrectly bet when I should fold.
My mouse broke earlier and I have been forced to use my touchpad.
Does anyone actually use these things all the time?