The Burmester chrome plating is in a league of its own; aside from fingerprints (use gloves), it will not deteriorate with time passing. Ask Ivan, he has Burmester for some years now and I'm sure it's spotless.
In the same price range you could also try the Levinson 52.
Nš52 - Mark Levinson
If dropping around 30k on a preamp you need to try as many models as possible before deciding what to buy; I'd make a list with balanced SS preamps and see what I could home audition.