That answers my question then - on the 1440x900 13" MBAir, the black lettering from Practical Typography is jarring, and unpleasant to read for long periods of time for me, but Medium flows very well - and I read tons of material on their site.
PT is just very unwelcoming for me to read - both the diamonds all over the place (which reminds me of the PCL printout when you didn't have the correct font installed), and the assault on my eyes. Perhaps on a higher-resolution retina display it works out better (and perhaps Medium suffers somewhat in comparison)
I'm on a few-years-old Lenovo laptop with an ordinary 1366x768 display, and it looks fine to me. What browser are you using? Can you take a screenshot?
PT is just very unwelcoming for me to read - both the diamonds all over the place (which reminds me of the PCL printout when you didn't have the correct font installed), and the assault on my eyes. Perhaps on a higher-resolution retina display it works out better (and perhaps Medium suffers somewhat in comparison)