Tried bidclerk for about 3 months. I thought the biggest problem was that there wasn't much time between the job posting & bid date. I thought a week was short notice to pick up plans, get muncipal specs, put together price, cold call as many GC's that were bidding on project & getting them bid on commercial projects that were $100,000-$150,000 in site work.
There are a few other lead sites that some guys I know use who do municipal pipe jobs. Those site cost about $3000/yr.
They are more in depth & have sections about jobs in planning stages. Those sites also seem to post jobs earlier than bidclerk. I miss the days when my phone was ringing daily with jobs.