I have tried several brands of catnip bubbles, and only Kookamunga and the Petco brands caught my cat's interest. He likes both. The Petco bubbles have less smell (and therefore generate a little less cat interest) but the bubbles are sturdy enough not to pop the moment they hit the carpet. My cat prefers the Kookamunga catnip bubbles over all the rest. In fact, when he wants bubbles he taps the bottle (sitting a low shelf where he can reach it just for that purpose). I've bought two bottles TWICE and I'm getting ready to order more. If my cat likes it, then I'm happy. :)