I have been using an Arcus cello bow for several years and was an instant "convert"! On the rare occasions when I need to use my reserve wooden bow I miss the Arcus for it's ease of playing. You might imagine that the pay-off for such a lightweight bow would be a lack of power, but not so, the Arcus bow has a fantastic strength from heel to point and a balance and poise that needs to be experienced to be believed.
I am now doing a lot of electric cello work and have found the Arcus bow to be ideally suited to this way of playing also and have therefore purchased a second identical model. I am such a fan of these bows that my friends all believe that I secretly work for the company!