Without going into full details on how I am doing something. I am working on integrating Dyanmics SL, Avidian Prophet (CRM) and Aspdotnetstorefront.
From every thing I heave read dotfeed doesn't not import back to the store database. Instead it only exports consumed/transformed product data to third party sites. For the integration to work we need the ability to have all data flow between both ways.
And before this integration we had built a custom Intranet with internal product information that pulls data using WSI. So we are already invested in the technology of WSI using WSE. Which also means I am more familiar with using WSI and doing customization to WSI.