Be careful as well, I've been very lucky, only one date on which I felt uncomfortable but it wasn't that bad, I've heard some right horror stories though, especially from the guys and some sites do have a bit of a reputation for people who are only after one thing. Always follow the security advice, meet in a public place, let people know where you are going, call people to let them know you're ok, have an escape plan if needed etc...
I've not found my soulmate yet but have had some lovely dates and made some very very good friends.
I posted a similar question on Saturday so you could check that out as got some lovely answers :)
Hope this helps. Let us know how you get on.