Sito muffler (R100GS)

I just bought one of these mufflers at what looked like a good price
after I saw they were stocked by motobins and siebenrock, both of
whom I'd have some trust in as suppliers.

After making the purchase, I found some really disparaging comments
on one of the BMW mailing lists and I'm mildly concerned that I may
have dropped good money on a POS.

It's still on the way, but I'm curious if anyone has had any
experience
with Sito.

Anybody ever used their products ?

TIA

Rob Kleinschmidt