Just to clarify, the original WBOW dvd was filmed using PR, I am fairly sure of that because it was filmed way before Christian des Garets created Berins. However, the new dvds have been filmed using Berins / Berodin wax. (Currently undergoing name change.)
I have used both waxes, I used to use PR before Berins arrived in the UK but I wouldn't go back now. Obviously many of you know I am the UK distributor for Berins / Berodin however, I know that Blue is a more advanced formulation, I know that it is more flexible and so forth and many PR advocates on here have never tried Blue and / or never given it a fair chance.
A lot of serious / busy full time waxers use Blue.