I recently purchased an Arcus Concerto viola bow ... and I thought I would let you know how impressed I have been with it. It really does perform as well as you claim on your website.
The performance of the bow is most remarkable. The combination of strength and elasticity, together with a very low mass allows for a very easy style of playing previously only possible with old French master bows. The sound that this bow creates, is of great richness, with upper partials having a freedom that is rarely possible with a wooden bow. The different position of the centre of gravity caused some initial problems, particularly with accented and articulated playing at the point, but a slight change in bow hold and technique has solved this problem.