This is a simple plastic strip with teeth on it. You shove it into your dirty drain and it pulls out stuff that you really don't want me to describe. The crap that comes out of the sink trap could star in it's own horror movie. The price is silly for what you get but since it works, it is hard to complain and it is only about $100.00 cheaper than have a plumber make a call. At $5.00 at Amazon it really isn't priced too crazy.
If reviewing a product, it may have been received free of charge. That will NEVER have a bearing on my recommendations.