Just to add my own experience with this agency: I queried Erin Harris back in March 2015, and received a full request within 24 hours (less, I believe). She was very friendly and excited. I sent the full and waited. About two months later I nudged, and received a polite and complimentary rejection. Loved my voice, but thought my writing style might be more suited to the adult rather than the YA market. I was super bummed, of course, because I really like Erin, but so it goes.
I recently met her in person at an editors & agents meet and greet at my MFA program. She's very friendly, has a clear vision of what she's looking for, and seems to be shying away from "issue books" in YA; though I don't want to misquote her because that's just what I remember her saying, in a nutshell. She shook my hand and congratulated me when I told her my MS is now on sub, and said she loved my voice.
So from my experience, this is a courteous, professional agency.