I recall this being mind-blowing when I was 16. I expect it to be less mind-blowing now, not so much because I'm older, but because I think each person only has so many times they can get their mind blown.
I think it was valuable to me at the time, less valuable to me having had my mind-subsequently blown by the Sequences, which are more coherent and with greater sense of purpose behind them.
Yeah this was super awesome in the seventh grade. Not so impressive these days.
God's Debris is for people who "enjoy having their brain spun around in their skulls." I think I can safely assume that this descriptive of a larger proportion of LessWrongians than the average population.
Without going too far into depth, I will say that it is one of the more enjoyable reads I've had lately, the philosophy the main character espouses is coherent and astoundingly seductive in it's simplicity - even as it requires you to tilt your head and squint a little to see it.
Scott Adam's God's Debris