They should know the limitations up front of each option. like, if you import sales trx with inventory, and you're not integrated (which is a great way to get invoice history), you're also not updating inventory and the history of the items. And one report I can tell you Sage 50 users like is Item Sales by Customer. And if they DO have inventory, and it's FIFO, do you have to bring in all the inventory by tiers? Or would they accept it all having a value as of this date, which would throw off gross profit calculations when you sell it.