I signed up with CADGround and the biggest problem I've personally come across so far is the lack of client screening. Sure you can bid on a job, but you'll never know for sure if the client is interested in you unless he/she contacts you. More times than not I have attempted to contact a client just to find out that their contact and project info is incorrect! I have bid on jobs that have turned out to be posted by accident if anyone can believe that! So far I am not too impressed, good thing it only cost $100.00. I have also sent my concerns into the administration there to get nothing but lame excuses back. It would be a 100% improvement if they would just properly screen the people posting the projects to work on.