I ran into the same issues, so I opted to fly up to White Bear Lake for a personal listen. Wendell and everyone at the factory were very nice. Wendell gave me a personal tour of the factory that lasted almost two hours! Then I spent three hours listening to the 20.7's in their factory listening room (ideal room dimensions, but very sparse room treatments, electronics, and ammenities)... However, even under those less than ideal listening conditions I was able to be convinced that the new 20.7's are several notches above my old 3.6's; so I immediatey ordered a new pair from one of my local dealers (neither dealer in my town will ever have the 20.7's).
Btw, not too awfully far from Magnepan at White Bear Lake is a good hi-end dealer called, Audio Perfection. I spent half a day there listening to 3.7's and the Wilson Sophias and Sashas before visiting Magnepan. So, over a quick three day weekend I was able to hear the 3.7's, 20.7's, and several very good Wilsons. Ultimately, I felt that the 20.7's were the best speakers overall. The 3.7's are a " best buy" and a truly awesome speaker for the money.
My 20.7's should arrive in Sept (I hope...)