We did use the Rosco View on a talking show called ''On prend toujours un train''. You can watch some of the interview at http://www.radio-canada.ca/emissions/on_pr..._un_train/2009/
We shot the series last autumn and the sky was pretty well covered. If you watch the second interview, it was a bright sunny day, then you'll have a pretty good idea of the effect.
We use the roscoview on all of the windows. All shows were shot with three Sony F900 on a train, while it was moving.
The fun thing about the Roscoview is that it let the light coming in without stopping it like a normal ND would. We used four ringlite mini to light the set.
At one point, we did a day for night shoot. The light that was coming in from the sun was pure blue, and the interior was at 3200K. As we were tweaking the polarizer on our camera, the sky turn out dark blue but the sun didn't lost his power through the gel. Very interesting.
Of course we sandwiched the roscoview between two Lexan ( rigid plastic ) so we don't have any ripple on side shots. Never use it with any liquid, it will cost you a fortune to find out that it will ruin your gel.
Oh, for the price, well I work for the Government station :-)
I guess it's pretty expensive but worth every penny in our situation.