It depends on whether you like it or not. Go with how YOU feel, not how others feel.

There are some makes and models I actually prefer WITH a vinyl top, some I can take or leave, and some I would say NEVER.

In the NEVER category :

1) 1970-1981 F-body
2) Anything that had bold stripes from the factory looks terrible with a vinyl top (1969 Trans Am, 1970-1972 Olds W-30, 1970-1972 Chevelle SS)
3) The 1969 Camaro, because the vinyl top doesn't touch the drop molding

In the "Ok" category :

1) 1967-1969 Firebird
2) 1964-1972 GTO

In the "I prefer a vinyl top" category :

1) 1965-1972 Buick GS, especially the 1970
2) 1966-1967 GTO

I still have the factory original black top on my 1969 Firebird (black) on Carousel Red. I can take it or leave it, but I'm glad it's still the factory one.