I've always had leather cases and decided to get an aluminum one to better protect my new notebook computer.

Things I like:

1.  Great looking case.  Slim and attractive.  The color has a bit of a purple tint to it.  Not typical aluminum.  I've received lots of compliments.
2.  Better protection than my leather cases.  I would not call this crush-proof, but I'm confident that my computer and eye glasses are well protected.
3.  Good size.  Fits my macbook air with power supply, external dvd drive, iphone, iphone plug, a pair of glasses and several files.  With room to spare.  The main compartment has adjustable dividers. Should fit most laptops.

Things I didn't like, or perhaps I should say, things I didn't know about owning an aluminum case:

1.  It's much heavier than a similar sized leather bag
2.  It scratches very easily.  Leather looks better with some use, not aluminum.  So I end up babying my case like it's a laptop.

Overall, I'm very happy with my purchase.