I have the Booq Boa Squeeze, it's being used to carry my 2012 15" MacBook Pro w/retina. I've had a couple of Booq cases over the years, they are extremely well made, very durable, scratch and scuff resistant due to the excellent high quality materials. Much like my Crumplers, the Boa has supremely nice smooth zippers.
Very well thought out, the Boa Squeeze is compact in appearance yet rather cavernous in it's capacity. My 2010 15" MacBook Pro is a tight fit, but not overly so. Being thinner, my retina equipped MBP is a better fit. There's plenty of room for other essentials, and once loaded it's very well balanced.
About the only drawback is due to the shape it does not stand up, like a conventional back pack. I'm very adaptable, so it's of no concern. However if you routinely stand a back pack up and would miss that ability, it would be good to give that some serious consideration.
Of the various high quality backpacks, computer cases, and messenger bags I have, it's most definitely one of my favorites.