I bought this to replace my logitech MK520, which, believe or not, I'm using since 2012. This set has numerous disadvantages. Keyboard: Very bad tactile response, it feels like tv remote! imagine typing text on tv remote, that's awful! The mouse - cheap and flimsy and also it's base not straight, so it can't be laid flat on a surface, it will shake. Speaking shortly, I'm returning this.