Title: Big Disappointment Compared to MX 610
Review: I received this mouse as a replacement for my MX 610, which was probably the best mouse I ever had. This model is nowhere near as responsive as the 610 was and does not have as good a tracking either. They removed both the volume buttons and the notifications lights for emails and IMs. Instead they give you the completely worthless look up button which lets you highlight a word and search for it, whoopty freaking do.The only nice thing about it is the surface of the side grips, that is a slight improvement. Overall my placement 620 will sit in a box as a back up. I managed to find an MX 610 replacement. Try to find them since they are now discontinued.
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