
The company's website is here. I ended up not purchasing it from the Apple Store. If I had been able to find one in an Apple Store, I would have, but online I found it much cheaper on Amazon (retail price is $95, but I got it for $50), and I have been putting ridiculous amounts on my Amazon credit card, so my gift certificates covered it. It comes in other colors, but I liked this titanium and orange one best. They come in three sizes: small, medium and large, which hold different sized laptops. I got the medium as they claim it perfectly fits the 15" Macbook Pro, which it does. It also comes with some velcro-in padded inserts that you can use to customize the shape for your particular laptop. I actually used all of them in the bottom of the laptop compartment to provide a little extra cushioning.
The straps

My first reaction to trying the straps is that it is indeed quite comfortable to wear the bag backpack-style. It also works well over one shoulder with the strap in backpack configuration, so it's sort of a cross between backpack and messenger. It takes a little re-rigging to really switch modes, so I have been finding this the best way to be able to swap back and forth quickly.
Once I started using it on a day-to-day basis, I discovered a system that seemed to work well. I wear it backpack style as I walk to and from the train and my apartment, where it's not crowded. While on the train, I switch it to messenger style, which works better in the tight confines of midtown streets where I can put it in front of me, to the side, or slung around to the back depending on the size of space I need to squeeze through. The bag definitely feels much heavier in messenger style, but it's rather wide when worn on the back, and has been getting caught on things.
The other annoyance I have about wearing it backpack style begins with something BBP has on their site:

Brightly lined interior... or not
One of the things I found appealing about this bag that I now look for in all my bags is that the interior should be a bright color so you can find stuff in it. My bags, especially my computer bags, hold lots of tiny little cables and adapters, and generally I find them by sticking my hand way down into the pockets and finding stuff by touch. This is not really ideal. I was a bit disappointed when the bag arrived to discover that only two of the compartments have the fun yellow interior, and even that is a stretch. The big giant compartment is yellow, which is less helpful to me because I tend to put big giant things in the big giant compartment, and big giant things are usually easier to find anyway. The wide compartment in the front has yellow on the back side, adjoining the big giant compartment, but the pockets and the outer side are black. So you can sort of see things in the pockets, but anything sitting in the space in front of the pockets (which happens to be the natural place for all my cables and adapters) is lost in the blackness. Every other compartment in the bag is all black. Considering they tout this as one of the features of the bag, it feels a little half-assed when only one of the bag's eight compartments is fully lined in a bright color.
The shower test
About once a year it seems I find myself walking 20 blocks or more in a torrential downpour. The kind of downpour where it feels like there's more water than air in the air. For this reason when I buy a bag capable of holding my computer the first thing I do before ever letting it carry my computer is put it in the shower. I stick pieces of paper in the various pockets where sensitive items might be, and after letting my shower rain down on it for a while, I check to see if the papers got wet.
I'm sorry to say this bag did not entirely pass. The manufacturer clearly states on the website that it's water resistant, not waterproof, but I was especially worried by the fact that the laptop compartment is conveniently located behind the main flap so that you can take your computer out without opening the flap. It has a water-resistant zipper, but it's not protected from water like it would be if the flap covered it.
Outside of bag: soaked

My overall verdict is that while my test was probably more severe than I would encounter in the real world, if I were ever caught in a real rainstorm with this bag and anything water-sensitive in it, my first priority would be to get the hell out of the rain.
Overall
I think it will almost completely replace my usual messenger bag, the Timbuk2 Commute, which is also a great bag (and waterproof), and it should fix the main complaint I have about the Timbuk2, that it's too small to hold much besides my laptop and script and a few accessories. This bag holds enough stuff to actually be usable for rehearsals when I have to bring everything, and the different carrying options will allow me to distribute the weight better than I would be able to with a normal messenger bag, on those days when it's just too heavy for one shoulder.
Some little details I like:
The magnetic clip on what is presumably the iPod pouch is classy. A special softer lining on the inside would have been a great touch, but no luck.
One other oddity is the center mesh pocket on the outside of the flap. I'm not a big fan of mesh in general, as I think it will result in the contents falling out, either accidentally, or because a potential pickpocket can see exactly what's in it, limiting it to holding nothing more expensive than a roll of BreathSavers. This particular mesh pocket doesn't even have a piece of elastic at the top. Now think about this: you put something in this pocket, then later you need to get something out of your bag and lift the flap. The outer pocket is now upside down! Something that is designed to be turned upside down as part of its normal operation should probably be closed at the top. Odd.
All in all, this bag has some really bold and smart design choices, but I don't think it's going to fully replace any of the bags I already own.