I used these on cup cakes for my daughter's 5th birthday, and the girls loved them. I used white buttercream icing, and the tops of the cakes were flat so I had no problems. It is a bit annoying having to cut each circle out separately (although that still probably took less time than wrapping pass the parcel...) and brief guidelines on how best to use the toppers (eg icing type etc) would be useful, although not absolutely necessary. I've kept the rating at 5 though, as I couldn't find a similar product anywhere else.