|Not bad, but the murkiness is a sign of things to come|
I was pretty impressed and intrigued by its laser-like focus on bringing that OSR feeling to 5e, so I bought the physical copy. Part of this was motivated by the fact that the physical layout was touted as being very table-ready. A lot of people are focusing on the physical UX these days, and that's a good thing.
So what do I think? Well, it's pretty good. There are some solid mechanics and its very nicely laid-out. But it's not perfect. As for the primary mission of sneaking some OSR chocolate into your players' peanut butter, I think it's similarly a mixed bag with a lot of positives.
Most importantly: is this a good product for you? We're going to have to get into the weeds a bit to answer that question, so get your hedge-clippers and follow me over the fold.
(Metaphors aren't always my strong suit.)