I much prefer this calculator over a TI 2-line-display one I bought around the same time. Primarily because the buttons are where I expect them to be from my experience using previous TI calculators. Also this one has the 1/x I use a lot... sometimes I divide two numbers the wrong way but my error becomes apparent as soon as I see the result... or I intentionally divide them the wrong way because the first number was arrived at by previous calculations... the 1/x button flips things around and saves me a lot of trouble. Leaving it off the 2-line model was dumb.