I'm testing the app and let me say it's very promising.
One thing I'm missing now is the ability to copy & paste vector between this and other apps, like Fontlab, Glyphs and Illustrator. I can do this between these apps and it is very handy, me being a type designer and using more than one app at the same time.
Also a tool similar to Illustrator's Blend Tool would be nice, maybe extrapolation as an extra added :)