Summary: It's slightly bigger than a standard mouse which is great for the comfort, without having too big of a footprint on the desk. Great quality, and response, with a touch type scroll wheel. Great purchase so far!
but it is still comfortable in the hand and easy to use
Christopher Firman "Firmy", Amazon
16 April 2015
Summary: I purchased this trackball as a replacement for my old Logitech Cordless Optical Trackman Trackball (http://support.logitech.com/product/cordless-trackman-optical), and I find it to be a relatively satisfactory replacement model.
Summary: Had to stick small rubber feet on the left and right switch paddles to use them without shifting my grip to click. The scroll ring is horrible. I tried to learn how to use it for a week before I gave up.
Summary: Kingston makes great stuff. This won't stop me from buying Kingston products but I don't recommend this particular trackball.
Pros: It's wireless. Seems to be durable & reliable.
Cons: The touch scroll ring is very awkward. It's easy to accidentally manipulate while using the ball. A mechanical scroll ring with a larger ball would've been preferred. Sometimes the mouse "wonders" so if you leave it turned on, the next day, the batteries may be dead.
Excerpt: Just got it to replace a Logitech wireless m570. The Kensington mouse is more precise than the M570. The touch scroll is easier to use than the scroll wheel although I wouls like to see a button to convert the ball to a scroll function.
Pros: Easy To Set Up, Never Freezes, Quiet, Versatile
Excerpt: I have been using Kensington Trackballs for a long time (Expert Mouse and it's predecessors) and always loved the way they worked. I bought this one because I wanted to lose the wire. This Trackball is a bit of a disappointment to me.
Excerpt: Very smooth and well made. I love the size and shape but the buttons are a bit of a reach. I love the touch scrolling! I don't accidentally scroll like some have reported and the position is perfect. I have always used a trackball (Logitech Marble) so I adjusted to this one in a few minutes.