What you will notice

First session and the days after: the skin is pink for some hours, then smoother and better hydrated to the hand, which is the roller and the ampoule's water-binding ingredients together. First week or two: tone and radiance read better and puffiness settles, the fastest and most reliable change. Weeks two to four: this is where the maker-side measurement fell, with surface roughness lower and the dimpled look on the thigh grading better, usually after a session each week. Weeks four to eight: firmness holds if the sessions continue, and drifts back if they stop, since nothing structural was removed. Longer: treat it as upkeep for skin quality rather than a course with an end, and judge it on how the surface reads, not on the tape measure.