I just put cupcake knobs on my Fillmore 25. I think they look better and are easier to read, but that's not why I changed them. I changed them because simply putting the cover on the amp moved the chicken head knobs! I played at a jam on Wednesday night and, when I went to play the amp the next day, the green channel master was bumped to 0 and the red channel gain was turned all the way up.
I think they look extra good on the brown amp.
Also, I replaced the C90 speaker with a G12M-65 Creamback.