I bought this calculator for my schoolwork needs - I needed something durable, capable, yet cheap. I didn't want to buy a graphing calculator as those can cost alot - in the $100s range. So I found this calculator for only $15 - a very good price for a solid calculator. It has a little solar panel on the top, so there's no need to buy batteries. It includes many functions that should cover all up to levels of Algebra 2, possibly higher.
Some of the features included are typical Sign, Cosign, and Tangent buttons, 5 memory slots to hold numbers in, the ability to enter numbers wider than the screen of the calculator (it scrolls to the right instead of stopping in a typical calculator), and a host of other features that can be accessed by pressing the "2nd" button.
It's very light, has a durable plastic cover that slides onto the front of the calculator when not in use, and slides onto the back when you're using the calculator. The sliding cover protects the keys and helps the calculator last longer.
I've had this calculator for about half a year now, and it shows no signs of wear whatsoever. I'd highly recommend this calculator if you want a good one but can't afford to get a graphing calculator yet.