Depends on how you read it. His writing is very playful and he tries to break up dense parts with a lighter part or an allegorical retelling of the previous info.

I'm a pretty quick reader, so the first time I read it I got through the first third easily but then had difficulty and quit. The second time I read it I took it more slowly and did the exercises and got through it without it feeling weighty. Even if you don't want to do the exercises/examples in it, I'd say it's still worth reading and a good chunk of it very readable without playing along - you don't HAVE to get to the end to get something out of it.

It gets denser as you go on because it builds on previous arguments, but if you take the time to absorb what he writes and do exercises it never gets super dense. It's kind of like in math when a symbol will represent a whole idea - if you already know that idea well it won't feel dense, but not knowing it so well will slow you down.