All through my high school career I've used Texas Instrument calculators. Texas Instrument is an extremely high quality brand that takes pride in their calculators. Throughout most mf my High School career I used the TI-30 XIIS Scientific Calculator, as it was the manditory calculator, and for a good reason. I've used other scientific calculators in the past, and a lot of them were difficult to use, and hard to make out what was on the screen. This however is NOT the case with the Texas Instrument TI-30 XIIS Scientific Calculator. This calculator is extremely easy to use, slim size, very easy to reed the screen, and extremely durable. I myself own 2 of these calculators. 1 for school and one for home use. In addition to great performance, the TI-30 XIIS Scientific Calculator comes in multiple different colors. Some of the many colors available include, Red, Blue, Dark Blue, Orange, Green, and Pink. Overall I highly recommend this calculator, as it helped me all throughout my High School career, and is an overall dependable calculator!