The overall score is rather 4.25, which is technically 4+ but is most certainly not 4. In general, I'm happy that I decided to purchase it. In general, I advise. Think about it! Also, keep in mind that it is far less in size than the K800. It is lot smaller. I believe that if I did not have to click between three computers, I would give some thought to whether or not I should take something. Regarding the comparison to the K800, look very carefully and reflect on what you find. "look" - it's really real, look at the arrangement of all-all keys, including the "calculator" (which for some reason shifted to the left by cm 5.6 - for some reason?!). "look" at the layout of all-all keys. The MX kit completely blew my mind, but as I've mentioned before, I need to be able to control three PCs with just one keyboard.