Good info, but it should be pointed out the articles you are linking to are somewhat dated. For example the CPL tests were done in 2008. The B+W Slim KSM C-Pol MRC 72mm was rated #1. There have been newer releases by B+W with new technology applied so one might read this article and buy this CPL and think they bought the best B+W makes, which 5 years ago it probably would have been but not today.