Here's my two cents on the Vector 40: I've seen quite a number of them fly, and they all seem to fly outstandingly well. Better yet, their owner/pilots all seem to love them. I can tell you all this much - I get a large number of orders for sheeted foam wings for Vector 40s at Robin's View Productions. In a way it has become the new Nobler. Many people use the wing and tail and the mannequin of "numbers" of the Vector 40 and stretch new clothes (aesthetics) onto them. Just like they used to do with the Nobler to come up with an "original." Not a bad idea...
But, again, it is not just the design that counts, it's the execution of the build and the components used. It must be built light, straight, rigid, have a proper power plant, and a fully adjustable and robust control system to be a great plane... Just like any other great design.
Try one, you'll like it! - Bob Hunt