I read his book back in the day and I didn't really agree with his ranges. Thought there were a couple spots he was calling way too wide (down to 54s in some spots with players behind). That said I had no way to show my ranges were better haha. Only real way is for someone like nanonoko with a few million hand database to chime in with his empirical results, but it's always been the area where I beat my head against a wall and could never justify answers.