Haven't used in real practice yet, but have played with it (my son decided the check the contours of my face with it). Slides easily (actually, bigger one is smoother than smaller one), and has a "lock" so you don't knock it out of alignment when you go back to trace on what you intend to cut. I have wanted one for a while, and this seems to fit the bill. As I say, the smaller one is a little stiff on the slides, so probably 4.8 stars, but won't let me do that. #RankBoosterReview #Sponsored #Jespeker