The main drain leading from my house was backed up sewage seeping into basement. Called one plumbing company who misdiagnosed the problem entirely, offering a $1500 fix which in hindsight would not have fixed the problem. Called Roto Rooter for second opinion. They showed up on time, were very professional. The problem was fixed within 48 hours which included digging up and replacing the pipe in subzero temperatures. Have recommended Roto Rooter to several friends, and all positive experiences reported.