These are very useful to help us in protecting our very scratchable furniture. It is the first time purchasing and using a product such as this. After reading reviews about knock-off glue harming kitty's nail +/- nail beds we have opted to use the legitimate brand. So far we are loving it. Learning to apply them properly was a learning curve but I'm sure we'll have it perfected with no problems. Getting the amount of glue right is crucial as we were a bit cautious with it at first and within a day almost all of the nails had fallen off! So don't be afraid to get down and dirty because kitties use their paws alot and the glue amount needs to be enough to properly adhere to the nail. There are many videos on Youtube helping with the application process. Kitty was not phased by them at all or picking at it which was wonderful. She is able to walk normally and do all her necessary activities (including stretching and scratching!) without damaging her surroundings. We will be purchasing more once our supply ends.