My (wired) 18 month old Intellimouse packed up yesterday so I got a Wireless one today. My impatience meant I got it from PC World. £49.99 which surprisingly is the same price as the wired version. I much prefer this model of mouse as I have big hands and this is comfortable where titchy mice are not. The wireless one is better IMO, not only because there's no wire (for the toddler to try and swing from) but also because of a slight re-design which puts a groove in the sides for your thumb and little finger and raises the back and forward buttons out of the way of your thumb. The problem I had with the old model is accidental pressing of these ancilliary buttons so I as forced to disable them. In the new model they are difficult to accidentally press and so are now enbaled and very useful. The weight of the mouse is nice with 2 batteries in, and the unit is RF so the reciever is discarded under the desk. I like it.