This has an intriguing premise and some challenging ideas, but the writing style is, I'm sorry to say, quite dismal. Priest is no literary stylist that's for sure, which meant the only thing that kept me reading was the force of his ideas - which in this case start to run out of steam well before the end. The style is ultimately the thing that drags this book down for me - it's written in a flat, everyday style which does nothing for the subject matter at all.
Like other reviewers, I foubnd there were great swathes of detail about supporting characters that ultimately played little part in the central narrative. For instance, the GunHo executives who turn up at the Bulverton Hotel - there was an intriguing idea here about the entire town's experience regarding a series of fatal shootings being signed up for eventual programming into a typically expansive ExEx scenario, but by the time the big cheques are bandied about, this particulad thread had run its course and the characters simply disappear, never to be heard from again.
The unfortunate thing with Christopher Priest novels is that there are much better stories to be unearthed within them - something that Chris Nolan did exceptionally well with The Prestige. The Extremes is the same, inasmuch that Inception covers the same ground, but does it a whole lot better.
So, all in all, a diverting read but I struggled to get to the end.