I tried it about 10 years ago and also know people that have had good and bad experiences with it. I guess you just have to realize that some people are dishonest and many people are sensitive about the physical image they have. You have to be most careful and "vet" people.
This means talking to them a while over the computer and writing down meaningful questions with their responses. Moving to the second vetting, talk to them on the phone and casually bring up some of the questions and/or responses they gave you. Answers and information they gave should match, not entirely something different. Ask them about previous relationships and work history. Casually and lightly, ask if they have ever done something to get back at an ex. If you don't like the response, take them off your list to meet and date.
Thirdly, meet them in a very public place at a busy time of day. Have people around. Don't provide your address. Don't get in their car and let them drive you anyplace. And this means for more then one meeting. Don't go to their home or invite to yours until you have been meeting and talking for at least 5-6 times. If there is anything that sets off your "personal alarm," don't continue the relationship.
This advice is for males and females alike! I have a male friend who had females inviting him to their home on the first date! How stupid can some people be? He didn't go because he was anxious that such a woman might have a friend there to rob him or something even worse. Use your common sense. Most people will be okay, but there are definitely some crazies out there!!!