Arrived new & factory packaged - Recent ownership & use of two weeks. This model replaced a short-lived wireless HP Comfort series mouse purchased (locally) only last Dec. 09'. Sure can't comment on this components longevity yet, but currently device works well & functions properly. Smaller overall vs HP full-size edition, mouse still has a decent heighth & arch. Definitely favor the lighter weight & single AA battery use. (Never used side buttons on previous unit and this one thankfully has none.) Optical function provides responsive & standard 360 degree tracking performance. Top-half color of this Microsoft mouse is actually a lighter silver-grey (almost metallic) shade, rather than what photo projects. A sharp looking, contrasting two-tone appearance . . .And which simply looks good against our also new, grey Giant mouse pad purchased from this site as well !