First things first: when you get the bag, it takes some "breaking in". The nylon is tough (which is good), but that means it will be stiff and needs a few days to loosen up. After that, it's an awesome bag. Comfortable to carry, very very durable (I would rate it up there with LL Bean quality, for those of you who've had the same backpack since grade school... you know who you are). The 15" MacBook Pro fits absolutely perfectly in the sleeve, with no room to spare (but that's good... it won't shift around on you).
Now the bad news: even after break in, it's not as spacious as you might hope. I would not recommend this bag for current students (having just graduated from college 2 months ago, I know). Once you get your laptop in there, you realistically only have room for one, maybe two, text books if you're also carrying your charger and some other bulky stuff. For newly minted professionals, this bag is perfect, especially the black. It's sleek, minimalist, and professional, while at the same time still retaining some youthfulness. All of that, plus if your only carrying your laptop and a notebook everyday, like me, the bag is lightweight and comfortable.
Great product, and I would most definitely recommend it!