I think this supplement is fantastic! Within 2 weeks I noticed a reduction in hairballs. Due to continued use, and using a commercial hairball treat, Gracie's hairballs have been eliminated.
My other cat, Percival, also benefited from this supplement. He is very sensitive and can get diarrhea from any little change (whether food, a bath, thunderstorm, etc.). This supplement dramatically reduced his diarrhea within one month. Now, he rarely, if at all, develops diarrhea.
In addition, both Gracie and Percival have glossier coats.
I DEFINITELY RECOMMEND this product.

Pros: improves skin & coat condition, helps eliminate hairballs

Cons: has to be ordered online, hard to find it in stores if at all