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I have been using the Casio FX991ES for the past 4 yrs. Its a gr8 device for engg. students. The greatest feature is the natural notebook display which allows the user to write fractions and functions in a natural manner.
For just 100-150 bucks more than the 991MS model its a significant improvement with more memory, larger display, gr8tr function(ex:log10 and u can store stat tables) and easy and quick operations (very helpful during exams).
Bottomline: go for it !!!!