Of all the reviews on the internet only two products have high ratings not only for usability but also effectiveness. This is Novartis Capstar and Bayer Advantage for Cats. Most of the other tick and flea products don’t get very good reviews, even as these two products do have their detractors.
The Bayer Advantage for cats gets mixed reviews on the internet and most of the negative reviews appears to be that the application was to strong or that it is too expensive. Overall it still have the best reviews overall for an anti-flea solution for cats.