Please consider using a thicker font. This one is not very readable on my device (Windows 10 + Chrome + 17" 100PPI display). I can read it, but it's not a pleasant experience. [edited]
Unfortunately, font rendering is still a bit of a crapshoot, it differs from OS to OS and even varies wildly between Linux distros (which may or may not use potentially non-free freetype functionality).
In the end, I hope it's manageable. We're open to redesign offers though =).
Windows 10, Firefox 49.0.1
FWIW, I think it's a pretty common problem with many web fonts on certain platforms (windows?). I see it all the time.
Also, thanks for the post!
Hopefully, it's readable for by everyone now.