http://blog.alinelerner.com/about/
Another way to do it is go on Indeed at look at relevant job postings from recruiters that are well written. I find I can tell right away when they are useless; it's clearly cut/paste straight from the client and has a total "job shop" feel.
I don't know if you'll get an honest answer, but another good sign is that they have direct contact with the hiring manager.
Feel free to reach out, happy to answer any questions.