the deal clencher for I on this keyboard be the backlighting . the product name and price be secondary but important . I have have previous Logitech product and always be please with they , but I also do a great deal of research and read many review , so I end up choose this one . the price be also best here on Amazon ; especially give shipping be free . since I have not type on a full-sized keyboard in year , it take awhile to get use to ; especially since I use it on my lap in place of my lap-top ; but I have work it out . my lap-top screen break just after a year when the warranty , of course , have just expire , and I would already attach my old desk-top 17 '' flat-top monitor that have be collect dust for year , so I figure I would lighten the load and a little heat on my lap and use a external keyboard for my still fairly new souped-up custom-built lap-top that be in otherwise great condition . have get spoil to the backlit key on my lap-top , though , I could not live without it ; especially since I be a night owl . the back-lighting on this keyboard be brighter and the character be larger , so it be even easier on my older eye than before . that it be wireless make it even more endearing . it beat the heck out of have to lift my heavy lap-top on and off my lap every time I get out of my recliner , and since I be disabled and rarely leave home , and I probably would not pack it up and take it with I anywhere I go anyway anywhere , I essentially have a new desk-top that I can use from my recliner ; -rrb- I love the feel of the key , even though they be a bit stiffer and noisier than on a lap-top . I actually do not mind the stiffness , because I type so fast I make less typo , yet it be not so much pressure that my finger get overly tired . I wear earphone almost constantly , so the noise do not bother I , nor would it anyway ; and since I do not text much , it do not bother anyone else either . I love the feature where the backlighting turn off after dormant for just a second or two . you actually have to rest the palm of you hand on the bottom of the keyboard or strike a key in order for it to come back on . keep in mind that if you be not typing but keep you palm rest on the keyboard , though , the lighting will stay on and will consequently drain you battery quicker . I love that it have a on\/off switch for that reason , because even if I plan on keep it on my lap and use it to type only intermittently , I can easily turn it on and off . I would always use a mouse instead of the touchpad on my lap-top and primarily serf without need for text anyway . I have use the keyboard every day , but since I do not tend to text much , I have only have to recharge it twice in over a month , but you can also still use it while you be recharge it . I can not speak to any special function key as I do not use any of they . I love have the volume control and calculator key , though , and the placement in the right upper corner be easily accessible . I would long miss not have a numeric pad on any of my lap-top , so I be glad to have that back on this keyboard . I be extremely pleased with it , and believe I 'll be use it for year : -rrb-