"The 4D optical mouse is a great little critter. It is programable so u can use it to do various tasks. But what I like it for is the fact it requires NO cleaning since it has NO mouse ball. The smooth action is nice(even compared to the Microsoft piece of sh&* I had before). Considering how much the competition costs($50-and up) to buy one of these guys, I would go with this heads and tales over the competition! Reliablity is said to be excellent! If you are looking for one of these, dont wait, go buy it now!!!"