Not not till now i tried to use them. But according to your post itseems to be a tuff job. Its of if they look for
PR, Alexa but in that case they should pay better.
Any idea how much they pay per blog post. Do you need to get your post reviewed from them as it is with pay per post or its just direct.
If its direct looking to try it out. Cos getting it reviewed and then posting its a long and boring process.