Overall, it's a great keyboard and mouse set. My only complaint is the lack of features on the mouse - I prefer 5 button mice. Performance Haven't had any issues with the performance of either item. Durability The mouse and keyboard seem very well made. Design They have a nice design - very sleek looking. Comfort The mouse is decently comfortable. Neither the mouse nor keyboard are "ergonomic", but I wasn't looking for something ergonomic when I purchased these.