I also went the cap route on my 74 challenger and i am very happy with it. I had no windshield at the time, so took out the entire dash, so that i could easily repaint any of the painted areas of the dash and do the job easier. Again, it is not perfect, but, then my car will never make it to Saturday at Barrett-Jackson.
I will say i have entered the car in local shows, and does fairly well, and no one ever made any bad comments about the dash.
There are way better places to spend money on the car than on the dash.
Only problem i had with installation, was that the instructions that came with it, said to place it on the dash without any glue as a test fit. Then take it off and put on the glue and back on again. WRONG... without any glue if fits tight enough around the gauge areas, that getting it off from a test fit looked like it would tear in a couple of places. SO... Once it was on i simply lifted as best i could and sprayed in the glue where i could, especially around the windshield area as again the entire dash was sitting on a table. It sits well... and looks good in my opinion.