Has anyone upgraded their preamp with V-caps?

I can't speak about the teflon v-cap in output stage application but would like to comment that replacing 2 x 3,3uF Mundorf silver/gold recently in my Omega DUOs tweeter XO made a huge improvement. Very costly upgrade but worth every penny imo.
Duomile

Sherod,
I totally agree with Atmasphere. Why put in 2nd best, save a few bucks and keep on wondering whow the sound would be if you would have installed the v-cap. Put your mind at ease, put in the v-caps and enjoy your music!
As I said earlier, the V-cap in my tweeter XO is magic and it will show you how much lesser caps, even Mundorf silver/gold do harm to the signal!
regards
Michael