Not very good imo. Everything is hidden behind patreon and doesn't have clear import/export function. Just a confusing time waster of a extension. Sorry
The base features аre free. Watch the full tutorial: https://www.youtube.com/watch?v=r4iX53Qg2sE If you need more, become my supporter. It takes time to update the extension every time YouTube changes internally. It has import/export function and it's available for free too, just click on extension icon
