It's in my 'to read' pile too. I got about halfway thru & it's quite interesting, but it keeps getting overtaken by me wanting to read other thangs.
Have to say I think even in Seahenge he states his theories too much like fact and some of his extrapolations from actual evidence are a bit tenuous.
As Mark - I think - said, it ain't about Seahenge and I have to say that one of the few bits about Seahenge so far - his narrative of the initial discovery - really got on my nerves. A decent archaeological writer, but an extremely average creative writer methinks....
love
Moth