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Title: I have to return this unit.
Review: I have to return this unit.I have PX, Dell Precision 690, Dual-Core Intel Xeon 2.0GHz,2GB RAM, ATITM FireGLTM V7200, SATA 7K RPM 160GB HD.No mater how I adjust the mouse setting, the middle button and Scroll motion was sticky at best. With in the AutoCAD operation, Zoom and Pan Control was not property recognized with middle button and Scroll.I spent hours try to adjust property setting with no success. Down loading the latest driver did not help at all.When I switched back to the dell supplied corded mechanical mouse, every thing started working as expected.I have very good experience with Logitech product in previous purchase, however I was very disappointed in this product.
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