It's pretty overall, but the one character for which the illusion of proportionality really breaks is the lower-case L, which consistently appears to have a space after it.
I agree. The idea of using a curl instead of gigantic bottom slab serifs is nice, and the glyph looks good in isolation and word-finally, but elsewhere it really messes with the density. I would also prefer that lowercase I curl in similar fashion—if only because my handwriting is like that.
If you look at the paragraph sample on the webfonts[1] page. you will see it. Also, you could type words like 'flow' or 'follow' into the sample box to see it next to other fonts. This really highlights the extra space on the 'l' glyph.
ah. I only really notice it in multiple L's. It uses the openfont license though. Which means you can legally crack it open using fontforge and adjust the kerning, and redistribute it as pt mono improved if youd like
