I'm happy with this mouse. I had already used a trackball model and I admit it takes a little practice. I use it alternately with a standard model (for photo editing and precision) of the same brand. Unifying the system is practical for that. I appreciate the trackball because it relies wrist and does not take too much space. By cons I'm disappointed like other people by the quality of touch that makes this mouse a little low cost (hence 3 stars). Too bad because other mice of the brand have a much nicer touch.
