After 4 failed Green Gobler treatments and countless wasted hours plunging a stopped-up bathroom sink, I decided to spring for this electric auger. My 65-year-old house has numerous plumbing problems, and I have to call a plumber to clear a line once or twice a year. Within 15 minutes this device cleared the blockage. I noticed it was taking a wrong turn and going UP the vent stack instead of down the first few tries. Using the nifty rotation direction switch, I was able to take the proper turn downwards, right behind the wall. It's already paid for itself, compared to a $130 plumber call. I expect I'll still need the occasional main-line pro clean-out, but I should be able to clear most small jobs with this with ease.