Fairlay - 5
I had a very unique experience with this site: Around a week ago, my computer was infected with a trojan that presumably stole all my sessions and cookies. The attacker proceeded to sift through my various online accounts and requested withdrawals to his address on all my bitcoin-related accounts; I had around 2BTC on fairlay. When I noticed this the next day, I immediately sent an email to Fairlay asking not to process the withdrawal. I received an email back stating that the withdrawal would not be sent. Unfortunately, likely through a miscommunication or the like, the withdrawal did go through and the attacker received my 2BTC, I was really devastated. To my surprise however, after I emailed support about this, the owner of the site claimed responsibility for the lack of miscommunication and completely reimbursed me the 2BTC, out of his own pocket. So that should tell you how they treat their customers
Otherwise, I like the site. In general I like the idea of a bitcoin betting exchange. In addition, the commission is really low (2% on net winnings), and the interface is really clean and user friendly.