never heard of that. i readed many reviews of different aluminum cases but cant really remember of someone mentioning that. its an interesting point in fact.
you can find pros and - cons, do they exist? - pretty much anywhere. just look for a good review of an aluminum case and youll get it.
some most obvious pros, you must know: light weight, heat dissipation, construction and material quality and awesome look for almost everyone etc.
one minus i just remembered: relatively expensive, but thats up to you actually. i personally think that there is no reason to not pay US$ 130 for an awesome case if i spend US$ 230 with a video card.