I only lengthened by 3 inches, and some of my friends thought I grew 5 inches taller. It's hard to get away with it with everyone, especially if you used to be shorter or similar height to some of your friends. People may not know or remember down to the inch how tall you are exactly. But some will remember if they were shorter or same height as you. After lengthening to 2 inches, it was quite obvious that I was much taller than before, when I stood next to people who used to be the same height as me. This is why I'd ease my friends into my new height by gradually increasing my shoe lifts slowly prior to the surgery.