content: This is a great product when you can get it for a reasonable price! I bought my first one two years ago but the left button switch wore out last week. When I checked to order another one a couple days ago the price was $199 and I soon discovered this was because Logitech is no longer making the wired version. Luckily I checked back today and a vendor was selling them for $34, which is reasonable.Once again, this is a great mouse. It is easy to get used to because the buttons and scroll wheel are controlled by the same fingers as a normal mouse and all you have to adjust to is rolling the ball with your thumb (which is actually quite easy). The other trackballs have the ball in the middle and that changes everything.