Benz rebuilt it like OEM? Do you remember the rebuild price?
I would love to be able to compare a Koetsu rebuild with a Benz rebuild of a Koetsu, but haven't had the chance. I have no reason to doubt the rebuilder's skill, at least. As far as I can tell the Benz-rebuilt cart has the Koetsu characteristics you read about, including the Rosewood Sig's famous (and just delightful) midrange sweetness.
I'm afraid I don't remember the precise rebuild cost but it was cheaper than sending the cart to Koetsu.