good news: it works
bad news: IT IS GROSS!!!!
I used this product recently on the "slow" bathroom drain in an apartment I just rented. My advice before using:
1) Have rubber gloves, paper towels and a lined wastebasket ready
2) Stick zip-it down drain, wiggling as you go if necessary to fully insert it
3) Holding your breath, slowly pull it out (gunk is SMELLY!)
4) With paper towel, wipe gunk from zip-it into wastebasket, in direction of barbs
5) Rinse off remaining gross black water into sink, then dry zip-it w/paper towels (I could not bring myself to treat this item as disposable, it wasn't THAT cheap!)
This was EXTRA GROSS, since the hair and bodily detritus were the previous tenant's, not mine. UGH, YUCK! But it did work! /:ob