I have been a member of Entrecard for awhile now, but my major complaint is the lack of reciprocal droppers. I have tried various blog rolls and other stuff from the entrecard members, but I have found that you are lucky to get 3 out of 10 drops returned.
I have found that the time that I spend surfing a few traffic exchange's, has been a much better return on my investment, I have my own traffic exchange at http://forumfinderplus.info and I strickly surf that network of exchanges.
I just signed up at Spottt 2 days ago, and I am not all that impressed with it, not so much as one click to my site has come through yet. But I will try it for a week and then I will dump it, thats if it doesn't produce and traffic for me.
What are some of your ways to get a good flow of traffic to your blog or blogs?