The author of the review touches on pretty much everything that I think is wrong with the "37s philosophy". There are some spots in the review where it feels like the author got a little carried away. But a bigger problem is that if you are going to be critical about somebody else's work for not providing enough evidence, then you should make sure you do your homework. "Yet a quick search on 37signals reveals that it took money from Bezos Expeditions, the VC company that invests on behalf of the Amazon founder, Jeff Bezos, in 2006." - doesn't cut it.

Then again given the content of this book (and the style of writing) I doubt it warrants a rigorous review. Don't get me wrong; I think 37s makes great software and I love their design, the rest of it however...