This is cool, it would be great if you could play around with it before making an account - I expect you to lose a lot of potential users at the make account before trying stage.

This is neat! If you're taking feature ideas I'd suggest a button to hide/reveal the final recommendation because users may want to set the sliders in a way to get the outcome they want to see. Stopping and thinking carefully on what the value of each slider should be is harder when you see the number of the final decision float around on the side!