My male cat loves these bubbles, but he loves playing with bubbles anyway.  My female just looks and occassionally bats at one of the bubbles.  This formula makes LOTS of bubbles!  And it's thick enough to get three sets of bubbles with one dip.  This is sometimes a disadvantage because it seems to overwhelm my cat!  There is a slight smell, but it doesn't really bother me (I'm very sensitive to chemical smells).  I only gave 4 stars because I am not sure my cat is more attracted to these bubbles because of catnip.  He doesn't act the way he does with the herbal catnip...