I can give some personal feedback...
I'm a consulting editor who has, in a previous life
)), worked for MacMillan Publishing, and in recent years have been much more involved in self-publishing. I am not a fan of today's traditional publishing; I very much prefer working outside the box and being as creative as possible within the marketing realm. A hybrid of the two is what I prefer.
That said, one author with whom I have worked has been determined to go the traditional route: find an agent and submit to traditional publishing houses.
Krista Goering is her agent, and it has been a pleasure working with her over the last year. Honestly, I was skeptical myself at first, but her contacts have grown, as have her sales (albeit with small, independent publishers, but that doesn't concern me; again, I'm not a fan of the biggies...lol). A recent PW article discussed how the small presses are flourishing against all odds; I think this is the way to go, even though we'd all like to be able say Random House has published SOMETHING of ours.
I have found her to be very responsive, conscientious, and straightforward. She responds to email reliably.
While she may not have any sales listed as yet with large publishing houses like Random House (though WW Norton, as someone mentioned upthread, is an established, respected house), she has indeed succeeded in submitting to large publishing houses which require an agented submission.
The author I work with is very happy with Krista, and the NF book has recently been placed with a small publisher (not a vanity press). The fiction title is more challenging, obviously, but it is in the hands of acquiring editors who, as much as I hate to admit it, I couldn't have gotten to on my own.
Another thing I really appreciate about Krista is her patience. It's not easy working with an author AND consulting editor/co-author. She has managed that beautifully, I must say, and now that all of our roles are clear, it's smooth sailing.
AW is great for authors and editors to be able to get as much information as possible. It's a brutal industry and more volatile than ever. I appreciate this forum, and am glad I can provide some personal feedback to help the process.
That's my two cents.