I used to be one of those computer geeks that had the cutting edge computer products. We bought the first 2xCD, etc., etc., and etc. But, since I can't work for reasons that have to due with chronic illness, my husband and I have become more frugal with our computer dollars.
In fact, horrors, we bought this Dell computer about three years ago and we have not upgraded.
Recently, my mouse (with a ball) died. I mean quit entirely. I had to hit the left button several times before it would work. I would clean the mouse and notice pieces of plastic falling out of the mouse. At first, I thought it was running slower because of bots, viruses, etc. So I would clean my computer about every half hour.
Finally, I admitted it. I needed a new mouse. And I needed a cheap new mouse.
I found this simple optical mouse with a PS2 connector. It was a very easy install. The computer recognized the mouse right away. It was very inexpensive (14.99). And it had the same feel in my hand that the Dell mouse, except I didn't have to clean the rubber ball all the time.
So it is not ergonomic. It is not a trackball. It is not a new type of wireless mouse. But hey, it works for me... and does a fine job. I like it.