I have played with a Concerto bow for many years now, but the new S-series bows are… without words.
It took me two or three hours to understand them (the new sound, the right amount of rosin and so on…). But when I finally found the key it was fantastic.
Particularly the one I have named the "Tiger" because of the special texture on the surface of the stick. The volume is twice the old Concerto. The sound is clear and definite… crisp I can say.
It is very light but I don’t have to press the stick with my first finger even for Fortissimo. And it runs right without any correction. The bounce is very very good. It is always under control and with some practice will improve even further.
I must say you have done a great work!