I love this calculator! I used to have the TI-84, but I gave it to my boyfriend who will get better use out of it since he has to do calculus and graph. This calculator has most of the calculus features as well, but I don't need to graph things. Compared to the TI-84, this calculator is smaller, lighter, and most importantly it's a fifth of the cost. It still has multiple lines (the best feature imo) and all the functions I need. I'm prone to losing things, but with this low price it won't be a big deal to replace it if I do. The only thing is that the cover is a little bit harder to put on compared to the TI-84, but that's not a big deal.