The guarantee is if you test there's no charge until it improves conversion rate

And additionally every recap has a button you can press to delete it and refund you.

So two guarantees:

1. overall conversion rate (refund if it doesn't help)

2. quality of each individual demo (1 click refund if you don't like a specific highlight-reel)

The explanatory video lost me with the snippet from the movie Wolf of Wall Street, about fraudulent sales texhniques. Pick a better example.