My trumpet came back from Anderson Silver Plating last week with newly finished and fitted valves. Wow. I couldn't be happier. Compression is probably better than when it was new. Slotting and tuning are noticeably improved. It was worth the wait and all of the $280 or so it cost. I highly recommend this service if your trumpet is getting up there in age and is played a bunch. I think Rowuk posted on another thread; now at least I have one less excuse.