Being one of the bigger names in plumbing, I called these guys first when I had a clogged kitchen sink. Make sure you tell them you just need an estimate first, and they'll send someone to check out your problem. This will not cost you. The plumber guy came and checked out my sink. He was friendly and professional. Then quoted me $160 to clear my clogged sink.. FOLKS, that is expensive to just clear a drain.
Pros: Professional. Will get the job done.
Cons: More expensive, sometimes 2x more, than the average plumber.