The connection is not the problem (DSL 16k) and also the library seems to be okay. I just like the idea of syncing without the attachments. Maybe it is not easy to maintain, but your product has also its price. Another thing is the legal issue. There are papers I am only allowed to use for myself, for example. But me and some colleagues sync all with one EndNote Web account. A lot of people do that and they all would like to sync without attachments.