I agree with Bub, I think it makes a big difference to the look of the car. Quite how much depends on the colour obviously, but on my denim blue - when it's clean - it looks great.
I have to be honest though that when I was looking at buying my A4 it wasn't something that even crossed my mind. Fortunately the car I bought had them fitted and it wasn't until afterwards when I saw other A4's without them that I realised what a difference it made. If I was to buy new, I'd definitely pay the extra to have them fitted.
Same story here, denim blue avant, the ally trim really sets off the ally roof rails. There's a black vanat with the ally trim nearby, looks v nice too. I think the extra windows on the avant make it a better option (IMHO) /ubbthreads/images/graemlins/grin.gif
My dolphin a4 doesnt have them, and I have carried the idea on by fitting an S4 non chrome grille and lower grill.
I think it looks great and used to be a cost option to have all black trims!...
(My moro blue s4 has 'bling' and that looks good also.)