I want to preface my comment with the fact that I own two Santana tandems and think that Santana make great bikes. Then again the marketing department (Bill?) at Santana sometimes illustrates what is unfortunate about much of bike industry marketing. For one example see the short quote taken from the document above:
...is it possible to believe a new frame will allow you to keep up with faster couples? Better yet, some might ask, is there a new technology that will allow you to finish ahead of teams that are younger, thinner or stronger? Actually, there is. We call it Bilaminate Damping™.
It would be great if buying another frame would make us finish ahead of stronger teams. If that were true this team would be in line to spend at least the price of a Beyond or a Calfee or a Paketa. Sadly I don't believe this is the case. There are small advantages to be gained by using the right tires, a lighter bike and the other things we write about here but they all pale in comparison to the difference in speed from just putting out more watts.
The Beyond (like other premium tandems) is a great bike and there are lots of reasons to enjoy a great new bike. I don't think we would go much faster on it.