We bought a pretty old house and the water was backing up. Luckily we had home insurance so we called and they referred us to Drain Rooter. Due to the insurance issues, they had to wait until the next morning to come out. Their customer service was pretty good, they called promptly the following morning and came exactly at the time they indicated.
They came and removed the stoppage and it was a root. That is probably they are called drain rooters! Anyways, the price was not that outrageous and they came promptly out and fixed our problem. We would use them again until we replace our piping, which will not happen until we win the lottery!