This is something I am not quite getting. I understand the Fulr migration process and the strain it surely puts your servers under. But ... the service you are providing to your new user base (which I am a part of) is lousy at best. I am having exactly the same issues as other users in this thread, and was looking forward to using Diigo as a central tool in some projects. The inability to import my existing bookmarks to my account is inhibiting that.
Diigo looks amazing in the demo videos. It is a pity the team doesn't seem to be that keen on offering a reliable service.