Let's face it: buying a new mouse for your computer is something even less than an impulse purchase. You want to spend as little time as possible doing research for this purchase, so I'll give it to you straight. The only three reasons to buy the HP X4500 are if (1) you just need a basic three-button wireless mouse; (2) you're right-handed; and (3) you have an aversion to the many better Logitech and Microsoft mice available.
The allure of the x4500 isn't its contoured platform or the razor-sharp laser sensor. It's actually the bargain price tag. You can get it online right now for less than $25 in the US, £21 in the UK and AU$40 in Australia.
The x4500 keeps it simple with standard left and right clickers on top and a notched scroll wheel in the middle that also works as a third button. If you're looking for a faster way to access application shortcuts, the Logitech M510 is a tinkerer's dream with seven buttons and a budget price tag.