Friend and a client of mine uses match.com.
A couple of his experiences:
1) Met a woman who he considers a great friend. They hang out a lot.
2) Met a woman, they went out for a drink. He had one drink, she had four. They went next door for food. She had another four drinks. He cut the "date" short and said he'd call the next day. The next day, he calls, makes sure she got home ok. Two days later, she emails him, swearing up a storm. Then he gets an email from a gay personals site, saying his listing was now online. Then he gets an email saying his listing was so offensive it was removed. So, long story short, he met a psycho hose beast.