It’s great to be a skeptic about it. Bottom line is to try it, do it safely after reading a bunch, be honest about how disciplined you are with your routine and give it a reasonable amount of time. See what happens if you do that and you will have an answer far more convincing than any private message will give you. The worst case scenario is you lost some time where you could have been doing something else and have no gains.

"Outside of a dog, a book is man's best friend. Inside of a dog it's too dark to read." -Groucho Marx