What if the three weeks don't make me better?

Even if you're a senior developer, ten years in and already using AI every day, you'll leave measurably more skillful or you'll get your money back. Earlier in your career, the gap we close is bigger, not smaller, and the guarantee is the same.

Measurably isn't a figure of speech. Day one is a measured baseline and you sit an exit measurement on the same instrument, so the delta is something you can see.