I think that Wilson is one of those companies (like, perhaps, Jeff Rowland), that produce the equivalent of sonic jewelry. Now, I happen to like both Wilson and Jeff Rowland, but I do think both are overpriced for what one gets. I don't begrudge or belittle anyone for buying them, however (including me, as I own a JR amp).
The DIY thread about Wilsons was interesting to me, though, from the standpoint of choosing speakers based on frequency response curves in an anechoic chamber. I'm not sure how valid of an argument that is. While the scientist in me loves data, I'm not sure that one should choose speakers based on only one data point (what about efficiency; transient response; etc.). The artist in me (sadly, an atrophied part of myself) also believes in listening/touching/looking. There has to be some happy medium, and the DIY thread tended toward the more scientific analysis using a single data point. I'm not sure that's valid.