I've had this calculator for over three years now using it in Geometry, Algebra II, Trigonometry, Physics, and Chemistry. So far I haven't had any issues where it couldn't solve a problem or at least parts of the problem.
The problem is that it doesn't have some of the more advanced applications like the TI-84 does. You'll get basic apps such as probability simulator, and Science tools (a sig fig counter, and unit converter), where if you spend the extra $10 for a TI-84 you'll get allot more, and the ability to download new ones off the internet, some of which can solve multi-step variable questions just by entering the problem.
So if your thinking about buying this don't, spend the extra ten bucks and buy the TI-84 it'll save you time and its got more games to play while your bored in class.