Logitech MK550 Wireless Keyboard Mouse (Open Box)

I bought this keyboard about two weeks ago. I had so many problems with it during that time that I finally gave up and returned it for refund. This is the first Logitech equipment that I've ever had so many problems with. In my home we have six keyboards altogether (some of them actively used, others on a shelf). Of our six keyboards, five of them are Logitech keyboards. As I type this review, I am using a Logitech keyboard, an "old-fashioned" corded keyboard with the keys in a straight line (with an "old-fashioned" Logitech corded mouse). **It works better than the keyboard that is the subject of this review.** The initial, original, starting installation of the WAVE keyboard and accompanying mouse took HOURS! The software ("Setpoint") is probably very sophisticated (24 Megs? I should hope so!) but I'll never know for sure. I got it running and I could use the keyboard and the mouse, but the full installation of the latest revision of the Setpoint software was never accomplished. So I tried to update the program. The Logitech website insisted on presenting their 64-bit update no matter how many times I checked off the 32-bit update choice. Then, clicking on the DOWNLOAD button on Logitech's site produced nothing. No response. Zero. Zip. Then I went to another download site ("Hippo") and downloaded the proper update. Then I attempted to install it and finally succeeded after several tries. Then I tried to run Setpoint. It refused to run, stating that an "essential" file "khalwraper.dll" was corrupted AND THEREFORE THE INSTALL COULD NOT CONTINUE. I did a search on the net and learned that "khalwraper.dll" is a virus of some kind, affecting the registry. Then I used another program to clean my registry. Setpoint still wouldn't run, again making the statement that that essential file "khalwraper.dll" was corrupted. Then I called customer service. I spent a lot of time in discussion, and I mentioned and named and slowly spelled out the letters of the offending file, "khalwraper.dll." The technician instructed me to uninstall Setpoint, using the Windows Control Panel Option to do so. I did, and that is when I finally lost my patience! The uninstallation of Setpoint left me with no mouse at all! (Have you ever tried to run Windows without a mouse, using keyboard commands only...?) After a lot of wasted time, I managed to shut down the computer, pull out all the Logitech Wave components and replace those components with this old-fashioned, non-wireless, non-ergonomic dinosaur. This old dinosaur works, at least. I packed up the Wave, returned it to Amazon for refund. Now I'll try to upgrade my dinosaur. Again. Some words of warning about `ergonomic': The word, "ergonomic" doesn't have a consistent meaning when used to describe keyboards, in my opinion. I found that the most common meaning of "ergonomic" in this context was a keyboard that was flat (that is, no *wave* in the height of the keys) but with a curve to the keys' layout, a convex curve from the typist's viewpoint. The word, "ergonomic keyboard" sometimes excludes the so-called "split" keyboard in which the keyboard keys are separated into two non-curved halves, one for left hand, one for right hand. Sometimes these halves are on the same chassis, sometimes not. Be careful when choosing an "ergonomic" keyboard and/or mouse. What you need and what you actually buy may not "match." Some words of warning about wireless keyboards/mice: If you wish to upgrade your keyboard and/or mouse, think carefully about what you want to change and why. If you use a desktop computer and only a desktop computer, think carefully about your need for wireless devices. How could using a wireless keyboard enhance your work on your desktop computer? Do you really need the freedom to move the keyboard all over the room? What's the point? On the other hand, a wireless mouse **might** be useful if your corded mouse gets its tail tangled in the paperwork or other debris on your desk. Think carefully! Maybe a corded keyboard with a cordless mouse is the answer. Don't go wireless unless you must! For those of you who use a laptop computer in a desktop environment, your needs are different. Think carefully. Decide. And when you have, look around and buy **exactly** what you need, no less, and **no more.** If you can't find wireless devices which meet your needs, look harder! Corded devices are available! And, in the long run, I do recommend Logitech.