I have 4 or 5 of TI-30X calculators scattered around the house for ease of use. The calculators have changed in appearance since the 1st one purchased years ago (and county of origin), but have the same durability, long battery life, and ease of use. I like this particular calculator over the more sophisticated ones I also have because the most frequently used functions are addressable without having to use 2nd or 3rd function keys.