Just wondering what some opinions are on the quality of Metalbestos VS Dura Vent stove pipe are? I have several quotes from dealers on the install of a new chimney system for an existing stove and the dealers using Metalbestos are approx. $1100 more than the one using Dura Vent. Most of the cost difference seems to be in labor costs, but I'm wondering about the quality of the products also. Any input will be appreciated. Thanks