This reminds me of website templates from Themeforest. You can make a lot of stuff with them and it can be really good, but you can only do so much.
The product and it's idea are truly great but if it explodes we'll see these fonts everywhere :D
If the team keeps adding new presets regularly though, this is 146% great tool I would highly recommend.
Love the idea, and the simplicity with which a fairly tricky challenge has been approached. Looking forward to more.
I personally, could easily see myself spending hours doing it. That's my MO. As soon as I saw it today I wanted to play with it. Icer for us more choices in science but also mixed with themes that you could show these two types of fonts go with this kind of theme and you can change the color for someone like me that would work very well this is too much