Hey! I'd love more info about this too, but I have a first hand account as well.
I currently work as an intern for an SLP who went to Northwestern and she has nothing but wonderful things to say about the program. She specialized in early intervention and now works at a pediatric clinic. Her case load is largely children with aphasia, though she also works with some motor speech kids. She says Northwestern's program is very personalized and the clinical training is really exceptional. She is also jealous of current students because the new clinic is supposed to be amazing! She continues to keep in touch with faculty to this day and recently visited with the dean, I believe.
Also, I've shadowed her and other young SLPs quite a bit and I think her training really shows. She is one of my favorite SLPs to watch because she is so comfortable and effective with the children. She is extremely knowledgable and can articulate her processes really easily. Of course, a lot of these could be personal qualities -- she is a pretty exceptional person -- but I don't think we should discount Northwestern's role in her being so great!
Let me know if you have any other specific questions I can pass along! She loves talking about the program, so I could ask her later today if I see her.