Does Astro-Physics, Takahashi or TEC provide optical reports? I don't know about TEC and Tak, I have never heard in an interferogram from either but I could be wrong. An optical report is a piece of paper, the quality of the report depends on who did the testing and how the testing was done. It's a matter of trust that the testing and analysis was done right. If you trust the testing was done right, then trusting that the fabrication and finishing was done right follows.
When you buy a Corvette, you get the specs, that analogous to getting the aperture, the focal ratio, the ED glasses used. But unless things have changed, you don't get an individual dyno-test of the rear wheel horsepower of the vehicle. That would be analogous to the optical test of a refractor.
Buy a zr1 corvette, they'll even let you go build your own motor. Also, its a lot easier to dyno a car than test a refractor, and 5 of the same car will have a lot less variance that 5 fracs will.