Hello! Co-founder here – wow, front page, that's flattering!
We have indeed still got a bunch of visual glitches we couldn't iron out, including the one ~saagarjha has reported to WebKit! We had assumed it was our font being broken, but i'm keen to follow that one.
Otherwise getting hinting right on all browsers in high-DPI has basically been impossible. Maybe we should simply recommend everyone use a Windows 98 User Agent ;)