I'm thinking about purchasing a new HP and don't know if the 49G+RPN has any advantage over the 48GX. I'm a structural engineer and use my HP 28S everyday. The casing is starting to split around the batter-holder and if it splits all the way, there will be no way to keep my batteries in the calculator. This is the second time it has happened and the first was covered under warranty. Any suggestions are appreciated.