Very light style for SF, half of it at least.
It just takes you along for the ride, presenting a world by following a person. Does make you wonder what kind of societies humankind would develop if people would be left to band together in places with very little or no contact to each other and having no proof of their past other than memories fading as generations pass...
Another thing I liked was that the author treated sex just like any other activity. Didn't focus on it, but didn't run through it without any details either. You know exactly when Jammy had sex, who with, and the highlights of the moment if there were any interesting enough.
OK, so that had nothing to do with a SF book really, but I was just pointing out another good thing.
Now the bad things... None really until Jammy reaches the Windfarm. Then things get blurry. While the Windfarm part might be intended as blurry, what follows is really a strain for the reader. Part two ends abruptly and you find yourself at the start of part three, some 20 years later, with all characters except Jammy out of the picture, a new bunch in and details about "who's who" aren't quick enough to follow. The whole part three is pretty bad and the ending leaves something to be desired.

Good world, book in general was good for the first two parts, but... Hasty ending maybe? Still, the general impression is a good one.