I've only used Match, but my experience has been pretty good.
I don't send out emails all over the place; I choose the ones I write to pretty selectively. Not everyone responds, and you need to not take that personally. You need to have decent pictures that are accurate to what you look like, and you can't send out canned emails to women. They're getting a lot of those already and they can see through it.
I joined about three years ago for one month. In that one month, I met six girls.
1 - Really hot Asian girl who liked to party. We went out on a few dates and I'm guessing she found someone else because she dropped me.
2 - Crazy chick who brought her ferocious dog with her on every date to coffee shops and book stores. I stopped calling her.
3 - Girl who didn't have accurate pictures. I didn't have the heart to just walk away and had dinner with her. We then went back to her place and had a one night thing.
4 - Quirky Asian girl who wasn't as hot as I wanted, but we dated and made out a lot. I kept dating her for about a year after meeting her and then we drifted apart.
5 - Eccentric Asian girl who took a long time to warm up to me. We emailed for a few months before she agreed to meet me. We dated and slept with one another casually for over two years. I imagine we'd still be doing that except she moved away to a better job.
6 - Super hot Korean girl was pretty serious for about four months. I count her as one of my girlfriends. We had a bad falling out, but we're friends now. I wish we were still sleeping with one another, but it's strictly friendship. We talk a few times a week even as she has a boyfriend and I have a girlfriend.
A joined again before Christmas with a three month subscription. I met four girls the first two weeks and then cancelled my subscription because I found someone.
1 - The first one was a lot hotter in her pictures than in real life. I know understand that the head shots that actors take don't look as good as the actual people. We got along great over email, but she wasn't as friendly in person. We went out once and then didn't call one another again.
2 - I like this girl a lot. We met a few times and got along great. She lives kind of far away, though, and I didn't keep up with her because I found someone I liked just as much who lives closer.
3 - I still go out with this quirky, nerdy Asian girl every now and then. It's always just dates, nothing physical, and we don't have much to say to one another. She's just someone to go out with.
4 - Pretty, sweet, loving, nympho girl. We've been together for four months. She's my girlfriend (for right now).
$50 for three months of Match is a steal in my eyes. That's a lot of entertainment that I wouldn't have had if I hadn't joined.