Everyone I've seen with a Kinesis who actually had a mouse had one of these.
They're also fantastic once you're used to them. I frequently consider switching to trackball, but my favorite option is still the Trackpoint. IBM/Lenovo really screwed the pooch there though.
They're also fantastic once you're used to them. I frequently consider switching to trackball, but my favorite option is still the Trackpoint. IBM/Lenovo really screwed the pooch there though.