I would like to throw my support behind Chrome as well after having just waffled back and forth on this same issue. After reading everything here and then hitting my LBS to check out both products in person, I just felt more confident about the Chrome's construction and how it fit me. I have to say even after expecting a fair amount from the bag I am still amazed through my first two weeks of commuting how well it hugs my back and the amount of stuff I can fit in it.

That reminds me, in terms of size I went with the metropolis and was slightly fearful it would be much too large, but I think it is a great size for commuting and certainly is not ungainly and I make use of every last inch of it. Only caveat I'll offer is that I am 6'1" so if you are a somewhat vertically challenged individual it might be more of an issue. Hope this was helpful and good luck on your purchase.

Riley