I haven't done that much testing yet, But I didn't care for the vga with my Sony 50a10 which is a fairly decent tv IMO.
I didn't care for it Firstly becasue there's next to zero options to calibrate the the picture settings, which I found to be washed out. I think it's weird that I can't do anything with the picture except some basic options with vga. I mean c'mon even my old CRT monitor has color options
I still have the cables, so I'm going to test some more at some point. It was pretty much immdiatly put back to component in my house as it quickly appearent that, I personally, didn't care for the PQ.
I'm more than happy with my upconverting dvd player for SD dvd's for now. Would I like to get rid of it? hell yes I would