I have owned several of these keyboard and mouse sets and they have lasted for years without any issues. I recently had to replace two sets one due to losing the receiver and the other due to spilling a glass of water directly onto the keyboard and I tried other more expensive keyboard sets and returned them to come back to this trusty set. I find it very comfortable to use and I find that my typing speed and accuracy is higher using this keyboard set than any others. I have never had any issues with the keyboard or the mouse and I have owned several and my staff use them on their computers in our office with no issues as well. After many years of typing the letters wear off some keys, but if you are a touch typist this really isn't an issue.