I purchased this TI for my Business Calculus class.  We are required to have a scientific calculator that does not have graphic ability. What I have found about this calculator is that while it works well, there are some additional steps that have to be taken when doing complex calculations. Where on some calculators you don't have bracket issues, this one, you have to really think out the steps otherwise the answer will come out incorrect.  It does however serve its purpose.  Once I figured out the bracket issues, it's worked like a champ.  I would recommend this calculator for those who need one for a math class, but I would invest in another version of the TI scientific calculator for more complex math class.