I've not used many of these deflectors, but of the different ones I've tried, these seemed to be the easiest. However, I'd have given the 5 stars if not for one fundamental issue. When applying the first deflector, I cleaned the lens, peeled the deflector from the backing, stuck it to the lens and screwed up the backing paper. I did the same for the second deflector except that it then fell of the lens. Upon inspection, I noticed that the adhesive was still stuck to the (now screwed up) backing paper. For both lenses! I slight knock on the first deflector and it fell off. I did the best I could to un-stick the adhesive, which lasted for about 5 days until one of the deflectors fell off. This would imply that the adhesive sticks better to the backing paper (which it shouldn't) than the deflector (which it should). Would I buy them again? Knowing the above, I'll try them one more time, but there are cheaper ones out there that I've not had this problem with.