I've used it with mixed success in the past. It's all about how you write the profile and the pics you put on there. I do not use it any more though as I have gotten laid to the point of almost wearing my dick off to a nub by using Plenty of Fish and acting like I actually want a long term relationship.
On POF all you need is a job and to be over 6' tall and you'll be banging so many middle aged women that you'll get tired of it after a while.