Narrowed down zc wood stove choice to either hearthstone montgomery, quadrafire pioneer, or superior wct6940ws. Whats the track record for either brand? Have heard of a common theme of hearthstones free standings firebox commonly cracking if there’s any truth to that? Any direct experience or issues with either brand? The superior seems to be the oldest model and yet its the only zc on the list for the tax credit. So i feel obligated that that is my only and smartest option on cost savings. Your thoughts would be much appreciated.