I have used this site on and off since 2005. I have met some very nice women, three of whom I have had strong relationships with. However, it is not all plain sailing as in order to get to the truffles you have to pick up lots of stones on the way. I guess I might be quite unusual as I am exclusive with the women that I see and I don't test drive half the women on the site which some men do. The seemingly scattergun approach of some of the men make the women very wary, especially those who have been on there before and so know the form.
I have seen some bad reviews of the site and some good reviews, but like all things you get out of it what you put into it. If you expect the woman of your dreams to land in your lap you without you expending much effort you will be disappointed. If you are willing to go on there for two or three months (extortionate I know), weed out the players, scammers and fakes and play nice then you might well get lucky. But luck is the key here. There are some genuine women and you have to really search to find them, especially in the London area where there appear to be women who are paid to lead men along and then mysteriously disappear just before your membership is due to expire.
In summary, weed out the players, bored "I can only meet during the day" housewives, those who want to be "pampered" or "spoilt" (Golddiggers), young 20 somethings who clearly do not have the maturity to be on a site like that (most of them are professionals) and those who have been on there for ages (the profile number gives it away). Try to get a phone number as soon as you can, but don't be pushy. If you get a refusal or "I will do it just before we meet" then they are probably players and don't waste your time. Most genuine women have a second pay as you go phone for this purpose anyway. Don't expect sex on a first date, have a flirt and a snog and arrange a second. If you get the second date then it's likely you will end up having sex.
I'm lucky as I have met the most gorgeous and lovely woman on there and I don't intend to go back to illicit encounters because I believe I have met "the one"
Pros
It can work if you are willing to put the effort in
Community spirit with IE events put on where you can actually meet women from the site without the commitment of a date
Cons
Bored housewives
Neglected women who want to feel wanted but won't do anything
Serial daters who see which men spend the most on dinner but won't do anything
Price