I'm a longtime Pinboard user but it has some annoying quirks. The biggest weakness for me is the limited search. e.g. Yesterday I was trying to find my kids' school menu site and searched for "menu"... nothing. Turns out I did have it bookmarked, but the title is "Menus and Pricing". So you have to search for "menus" to find it. I've made suggestions to the developer on stuff like this over the years but it hasn't improved much.