I'm not sure if this link was posted around here, but just came across it and as everything Mr. Puts published, it's a treasure trove, and not only on Leica stuff.
I do know that he felt that Leica's more recent digital cameras (at least as far back as the M10) betrayed the Leica tradition. He may (I can't remember) have also believed that the more recent "modern" M lenses also betrayed the Leica aesthetic.
There is such a high premium on Leica glass that knowing exactly what version of a lens one is considering buying (by its serial numbers) makes his work absolutely invaluable.