I got about a book and a half through that before I lost interest gave up on it. I quite liked The Illuminatus! Trilogy, but this set just couldn't keep me interested. I might go back to it one of these days just to finish it off.
The first book seemed to mostly be an exercise in demonstrating that anything that can happen, does happen- a novel idea that is somewhat lacking as a novel. The second book was better for me in terms of story where each chapter was almost it's own segment. The biggest flaw I think is a real lack of character development and it's pretty much required that you be familiar with the characters from Illuminatis to get any kind of connection there.
Illumanatis could be a good read on it's own, but I guess for the rest of Wilson's stuff you have to appreciate his style, and it appeals to a narrower audience.
Twice I've managed to get distracted away from going further than the first chapter of Pynchon's
Crying of Lot 49. Oh, well. maybe someday.
Gravity's Rainbow sounds promising.