I have be use the Logitech Combo mk520 with keyboard and Laser Mouse for a while now , and the operation be so seamless that I generally forget I be operate wireless at all . I have always use wire keyboard and mouse , and of course find the wire restrict - especially when I need to access the rear panel of my pc for any reason . my one previous experiment with a wireless mouse be short-lived , communication be inconsistent and eventually the software\/device crash . no problem here . setup be very smooth . although some prior reviewer note the keyboard touch be either better or worse than they be use to , personally I do not see any difference . I do not use many of the special key or feature . as note by many other , the calculator key be most handy and welcome . the music related function of mute , volume , next\/prior track all operate perfectly . I understand that the f1 - f12 key can be program to perform different function , but frankly I be not that interested . I use this equipment on my home pc , and for my purpose the additional programming be unnecessary . mouse operation be identical to my prior wire mouse . scroll be smooth . I do have to get use to the fact that if I accidentally knock my mouse to the right , since it be not physically connect to anything , it will indeed crash to the floor . it be a bit alarming for the klutzy , especially that one time the case pop up . but it be not overly delicate , and pop the case back down result in no harm , no foul . overall , this be simply a outstanding product in my experience . if anything , I have experience fewer problem with the Logitech wireless combo than I previously have with hardwired keyboard or mouse equipment .