[shafyy]

As said by Patrick in a different comment, it really depends on how your sales are going therefore comparing it to a traditional loan with a fixed p.a. regardless of your sales doesn't make a lot of sense.

I didn't read the exact terms, but based on the landing page it seems like your downside is capped, which is a big thing. I.e. if you suddenly stop making sales, you don't repay them . (not sure if there's a clause that makes you repay if you never make sales for a couple of years after taking out the loan)