The 35S is buggy as hell, poorly designed, the battery lasts too little time and the keys break easily. I owned one and regretted the purchase (I went through a

The 35S is buggy as hell, poorly designed, the battery lasts too little time and the keys break easily. I owned one and regretted the purchase (I went through an "own every calculator phase") This is the best thing on the market at the moment in the same form factor: http://www.edu.casio.com/products/Calculators_%26_Dictionaries/Fraction_%26_Scientific/FX-115ESPLUS/ http://www.edu.casio.com/products/Calculators_%26_Dictionari... If you want programmable then there's (but you have to import it): http://www.casio-intl.com/asia-mea/en/calc/scientific/programmable/fx5800p/?m_no=164 http://www.casio-intl.com/asia-mea/en/calc/scientific/progra... TI89 for me though.