I think that they're probably all very similar. I buy the ones in the pet stores but I haven't been giving my cats any for a quite a while. Some of them used to like the taste of the malt but then they changed the formula so now none of them like it. When I did use it, some of them seemed to cough up hairballs either the same day or a few days afterwards. It must dislodge any fur in their system and then they cough it up. I try to comb their fur at least once a week or more if I can. Ziggy usually won't let me though and she really needs it. I hope that Cole will continue to feel good and that you'll be able to control his hairballs. Good luck.