Like OrangeAppled, I'm just about to get back into this. It's been, what, 2.5 years since I deactivated the accounts I had at OkCupid and Match.com, and in the meantime I've moved to a new city, not to mention that I'm a bit older than I was when last I tried.
Honestly, my experiences were not great, not awful, and pretty typical. Didn't find a lot of people I clicked with well enough to really want to contact, and most of those I did didn't write back. Over the course of the year I really made a relatively consistent effort, I think I had maybe four first dates, two seconds dates, and nothing after that. It's just a difficult thing to try and connect with a total stranger, and to be entirely honest, I'm just pretty bad at dating. Nerves get the better of me, and I think I don't come across particularly well, at least not as well as I might under other circumstances.
But anyway, new town, may as well give it a try, right?