How can Wilson Audio speakers sound that good if they are using OEM drivers?

I only have a brief comment to make here, but one i feel future speaker buyers might want to consider.  Foam surrounds do not seem to survive well in wet, sticky climates (like Florida for instance). Apparently they can still be found in some expensive products, as I can attest to from personal experience.  I was able to replace the speakers with identical designs but now the manufacturer substituted rubber surrounds.  I believe some of the Watt/Puppies way back when also used foam and had to be repaired or replaced after a few years.