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Calculators are faster w/ Carbon fiber.. That's an Engineering FACT..
I have the older version of the MS..
Eh, I actually really like the look of the FX-991 EX. Nice colors and the texture is pleasant. Incredible calculator, though the name 'Classwiz' is pretty tacky. I still use both interchangeably though as some things are a bit quicker to access on the FX-991 MS, such as the engineering units (milli, micro, nano, etc).
Casio is the way to go for dealing with complex numbers, in my opinion.