Cool idea, chrome/ium bookmark manager is definitely a pain point. But I can't tell, is this a local extension, or does it upload bookmarks and stuff to your server?
Exactly my concern. But judging from some of the other comments it is indeed uploading your bookmarks.
I'm sorry to say, but I consider bookmarks slightly private, and I wouldn't want just any company to look over my shoulder and read all the pages I bookmark.
While the product seems awesome I'm going to have to pass.