I have signed up with them about 6 months ago and there are pros and cons:
Pros.: The ability to look for specific types of properties and have at your fingertips the phone number and the owner's mailing address (I used to cold call)
Cons: I was not very efficient with my calling b/c 50% of the time the phone numbers were not good. Also, many times they give you 5 or 6 or more numbers for someone that has a common name so i had to call through all of those to find out who is the property owner.
For now, they still charge me b/c I'm locked into a 1 year contract but I will not renew when time comes. Unless I figure out a way to be more efficient with it. If you do a mailing campaign that may be different...
Jun 23, 2010