I dont have a dog in the fight and I dont want an a$$ whooping for saying this. But, I heard from a local high end CC builder that they werent crazy about them and had issues. As mentioned above, call some of the CC manufacturers in confidence such as Midnight Express, Invincible and Intrepid and see what they say.

When I asked about the 557 I got the hands on hips and shaking of the head... Apparently, it just isnt worth it. A lot of the local CC guys insist on Yamaha 350's actually.