Any one have experience using a TV flattener with

I just got a Megrez 80mm Triplet Fluorite which is visually perfect, but really needs a field flattener when doing DSLR pics. See my site at: http://www.angelfire.com/id/kurtfriedrich/ and click on the text at the top to see my results. My tracking was not perfect, but you can see the big difference between the center portion and the edges. I see that TV makes a 2" TRF 2008 Reducer/Flattener which "converts TV-85 to 480mm f/5.6 and Pronto to 380mm f/5.4 for flat field, fast photography" and I would like to know before I buy it that it would make a big improvement.
Thanks
Kurt