This is already my second Arcus bow, after having played a Veloce as an ambitious amateur cellist. The Sinfonia bow suits me even more than the Veloce bow because of its lighter weight and super-light response. I still own a wooden arch, but don't use it any more. I have just been able to convince my cello student of the purchase of an arcus bow. Even as a beginner, she was simply thrilled with the easy approach of my bow when she tried it and has now acquired an S4!
Not even through the long rehearsals of an orchestra weekend have I ever suffered from signs of fatigue in my arm. They are really great bows!