Lots of comments saying the font is hard to read, but I don’t find it to be so. Perhaps a difference in browser rendering? Overall, I think it’s a job well done, and I’m much in favour of old-style serifs and justification on the web instead of yet another boring sans-serif left-aligned page.
Elements of Typographic Style is one of my favourites too. However, I’d suggest that for web publishing, Butterick’s Practical Typography might be a better guide than Bringhurst, who was primarily focused on print.