Our master bathroom has long had an annoying problem of the sink clogging from hairs. (I claim they are hers, she claims they are mine) I frequently had to run a snake down the drain and even took apart the p tube several times.
Then, I saw this item in the new products section of our Sunday paper. Went to the web site, thought it looked good and bought one. Easy to install and, thus far, no clogs. If one should happen, I just turn the knob and 'voila' cleared. Seemed expensive at the time, about $40.00, but, I believe money well spent.