I've seen them around for the last 2 years or so and it does get boring looking at it, especially when I originally thought it was the ugliest bag I've ever seen. I grew to like it and want one now because I can tell it's extremely durable which is what I need, although sometimes I do still think its ugly/looks cheap when its empty and saggy.
I agree though, it is becoming a classic.
Funny you say that because when I first saw it, it was sitting open on a flat surface and I couldn't tell how saggy it was. I was a little disappointed the first time I saw it hanging off someone's shoulder, but in the end the durability factor won me over, too.
I do like the way it looks better when it's full of stuff and not so saggy, but in the end I really do also like it's simplicity, that it's not a "look at me" bag. Some days I just don't feel like dealing with or thinking about the bag hype.
Now that I think about it, I'm wondering if maybe it was there all around me and I just never noticed it...