Its a bit difficult to directly contact folks on these forums, but if anyone including the man himself can point me to AdamJ. He mentioned he was using Foxycart with SS and I'm doing exactly that right now.
I would like some insight on using their Datafeed. I have the sample code working from their wiki but there is no way to test it without sending live data/CC transactions.
You can find my by hitting my profile and emailing me at FirstName.Surname at gmail dot com.