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Title: poor upgrade
Review: i own the previous version of this trackball and have used and loved every day... Then, i bought another one for my second system, and it is awful... just absolutely awful.... the ball feels very GRAINY to roll.... it sticks... it has not broken-in in over two months of constant use...this new model is very stiff... the "control ring" around the ball is used as the wheel to move up/down the screen.... same issue... very GRAINY... stiff.. i can actually hear the parts rubbing against one another....i love my old kensington track ball... but this new one i bought from Amazon is a total piece of junk....
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