If you are following an inbox zero approach (as I am), then there's not much point in using the sectioned inbox IMO. I guess it might be useful if you receive tons of email and you want to sort of go through it in an ordered manner, but normally I tend to unsubscribe from things I am not interested in, so there are little or no messages in the other sections.
I do inbox zero as implied above and I thought I'd hate the sectioned tabs but I actually love it. Only because I make sure the primary inbox is cleared constantly, but can take my time getting to the social one (where it's very easy to just select all and delete).
