I used to use the cheap stuff from the store, and wondered why my dog would randomly throw up every few days. I switched to this after hearing other owners were having similar issues. 6 months in and no side effects! To top it all off, my dog looks exactly like the terrier on the box.
This stuff is very effective, easy to apply, and well-packaged. Each application is in an individually packaged plastic/foil compartment. Actually, the packaging is unusually tough to open--I usually opt for a kitchen knife.