It wasn't a bad set up at all.. but I had purchased the 50-500mm Zoom fisrt.. so I essentially never used the 70-200mm and 2X except on very rare occasions.. thus the lack of example photos.
I don't hink this is the right direction if you are looking for something better than the 170-500mm. I doubt you'd get much better image quality with the 2X... and you'd lose 100mm (although the 70-200mm is a great lens.. using it with a 2X just is not the best way to go)
If you were to take the cost of the 70-200mm, and 2X T-con and the $$ you might make selling the 170-500mm... then you'd have the $$ for a 100-400mm.
Just a thought.
P.S. I don't think they were sharpened much... I don't recall what I used to lower the noise either.