I bought this calculator after having used a TI-83+ for a few years. The power in this little machine is incredible (and in fact uses the same processor as the Macintosh Classic computer from 1991) and the display resolution is fabulous, especially compared to the older calculators. While I have yet to use some of its more advanced functions, the ones I've used have been great. Some of the functions from the TI-83 are moved and take a bit of adapting, but after a few weeks you'll love the menus so much you'll never want to use a TI-83 (or a regular scientific calculator) again.