Not work on a Superposed, but:
I had Art's do a complete wood and metal refinish on a Winchester 101 in addition to some repair work and removing a stuck choke (which I think they sent out) on the same gun. Literally, the gun came back from Art's looking better then it did brand new. Literally.
MGW has done some good work for me, too. They did a good job diagnosing and fixing an intermittent FTF in a Citori under the Browning warranty. They also fitted a new butt to Winchester 101, but the wood-to-metal fit could have been done a little better.
I think Art spent a bunch of years as a Browning factory repair man before setting up his own shop.
