I do quite a bit of shaft swapping & have never had an issue whether the shaft is counterbalanced or not - I do like to play my driver at a certain swing weight (D2-D4) - I also think the Tensei Orange is only "slightly" counterbalanced, so comparing it with a non-counterbalanced one shouldn't be too challenging? - Again, I am only speaking from my own experience, so your mileage may vary ...
Paul