Dr. Bass & 2chFreak,
You are very right in your observations/comments. BTW, the cheaper Sterlings also have these Alnico magnets, but overall people prefer the T'berrys. I am happy that the magnet is not all there is to it. Actually everybody who has heard the Kensington recommends it, but of course it comes with its price. The general consensus of people who have heard all 3 and want the most bang for the buck is to go for the T'berrys, considering all aspects of price and performance.
Regards.