Met my current GF (about 2 weeks now) on OKC, and she's great so far. Fun fact: On our first date she told me that she used to do porn. After trying unsuccessfully to find her 'work' online, eventually she told me her alias and I managed to track her stuff down. This was after we started seeing each other exclusively.
Funny thing was that the second I started to watch the first video of her I found, about 30 seconds in I was like 'Hey, I've seen this video before! Oh my god, I've jerked off to my girlfriend in the past, before I even met her!'
One of the most weirdly romantic things to ever happen to me.
And further to the subject, OKC can be great. I've had a few flings, met some cool people, met a 'girlfriend' or two, and even met a woman a year ago who I now count as one of my closest friends in the world.