Yes, I have used them in the past. Got really good results. Was able to get four offers on a property that I was selling. I also used it to drive traffic to my open houses which worked well. The nice thing about them is they have fantastic customer service (ask for Bill).
He helped me set up my campaign, told me what the best time to send it was and even helped me with the subject lines. I would definitely recommend them.
Good Luck
John