I've recently bought a Hp 50g calculator and it offers the RPN mode which the Ti's don't have. I've been using algebraic mode up until now and I heard that RPN still beats it in the long run. I know that you can save many key strokes with RPN but it will definitely take me some time to learn the functions. Also, I am not allowed to use a graphing calc on most of my tests so I have to stick with my casio which is in algebraic mode. Is using both algebraic and RPN a good thing? Will I ever get them so confused that I will waste time on my tests/hw?? I'm a sophomore and I'm planning to use this calc next year for calculus and the SAT Is/IIs. Should I get confortable with this calc and use it on the tests? Will it benefit me for some problems?? What do you all think? Thanks for your responses in advance.