I use this bag daily, commuting by Boris bike in London with the bag folded double in the front rack, held in by the bungee. After 3 months of this brutal treatment and braving the elements, the bag looks ace - no stains or scuffs. It sometimes holds a 2Kg portable workstation, power supply, lunch and papers, all of which it swallows with panache. I'm still waiting for something to go wrong with the item I have dubbed the 'stealth manbag', due to it's deep matt black finish.
Update 2013: Now another year on, this bag still gets almost daily punishment on a Boris bike luggage holder, and it looks very little different, despite no care products being applied. A helmet goes under the flap when walking - with that big, casual flap, it's really no sweat!
Other reviews say it stains: I have not noticed this, but then I wear dark jackets. It's true the magnetic catches see little use - but the size and weight of the flap is so great, they become irrelevant, just not really needed, but they do work if/when you want a smart look.
One of my best ever purchases on Amazon. If it were a dog, it would be a Great Dane: relaxed, confident, strong, stylish, and very very big. Oh, and a nice price for this quality.
p.s. Good luck to the reviewer who is putting it on ebay and looking for something better! Be sure to let us know what it is...