I think the use case is pretty clear and simple, and somewhat appealing: You can use a todo list app of your choice, with whatever features you like, without getting locked in to a proprietary format.
Haven't used it myself, but if anyone has experience and/or recommendation for clients, I'd be interested to hear. It looks like it's been around for well over a decade.
Haven't used it myself, but if anyone has experience and/or recommendation for clients, I'd be interested to hear. It looks like it's been around for well over a decade.