"Right now, I'd consider building a bookmarking service on top of Dropbox or something where the user own the links / files. It's a challenging market, and many services have closed their doors."

"There should be an option to change the Collection category in first page. As it defaults to last used one, I find it difficult when saving some other stuff."

"When adding many items to different category, this is very painful."

"Also, When clicking the icon, It feels very slow, I'm assuming all stuffs loading directly from Web each time."

"Also, when saving link, it tooks a lot of time to fetch / grab screenshot.."

"Also, please give an option to automatically close the sidebar when an item is added."

"Next, it would be great if the sidebar automatically opens when I started dragging something"

"Also, I'd like to see a warning if I'm about to add a link that is exist in my collection."