Well I just tried the export from the store and imported the .IFF file into QBPremier 06 and all seems to be fine. We only use PayPal at this point in our venture so every transaction comes in as invoice even though its been processed. So I think it will require some modifications to correct it, but other than that, all seems to be working for now.
I am just amazed that there is little if no support on this from Xcart, but then again QB is another parties application.
BTW this was all done without applying any mods at this point all was set as default. We plan to meet with our accountant sometime soon to see if they can recomend any changes we would need to make sure QB is getting all the necessary information in the stores export, then move on from there.