I've had some of my silver buffed in the store to remove scratches, but only for my Confettis collection pieces which are meant to be mirror-reflective. One shouldn't have the buffing done too often, I was told, since it takes off a thin layer of silver.
As for cleaning tarnish, H will do it, but I've seen a pair of earrings that the London store cleaned and wasn't terribly impressed; tarnish remained in the nooks and crannies of the silver. Of course the results will vary store-to-store, but nonetheless I was not inspired by what I saw to want to shell out cash for it! So instead of paying H for cleaning, I use baking soda, vinegar, and boiling water (if you google that combo you'll see a zillion tutorials). Works like a CHARM with no scrubbing or paste, and it's so much fun to see the silver go in a bowl slightly dulled and emerge looking flawless.
It's quite different from all the others...
