I've gone on dates with two girls from that site. The first one was awesome, the first girl I slept with. She was hot, smart, funny and we had an amazing amount in common. Unfortunately she had some personal issues and I had to let her go. I met up with the second one last night. She looked very hot in the photos she sent, but in real life she wasn't so great. And on top of that she was really boring. My first meeting with girl #1 lasted 3 hours and it felt like 30 minutes, my first meeting with #2 was vice-versa.
Anyway just like in real life, its a mixed bag. But remember that even if the girl sends you tons of photos, you'll still have no idea what she really looks like until you meet her -- that's the major disadvantage over meeting people the normal way. I thought girl #1 was going to be average-looking, but she turned out to be way hotter (on our third date a photographer tried to recruit her for modelling). I thought girl #2 was going to be really hot, and she turned out to be plain and slightly overweight.
Also alot of girls are on there to compile huge lists of double matches as an ego thing, so try to get her number/set up a meeting early on so you can weed out the flakes.
In any case I'm done with that site for awhile, it sorta becomes a crutch preventing you from having the motivation to meet girls in real life.