This is a feature that FluentU has and I think it's really helpful. I'd like to be able to browse lists (that I haven't added) and see what percent of that list I already know. For me it's good reinforcement of how much progress I'm making. For instance, as I'm studying my word lists from various lists, I'd like to know how many HSK 5 and 6 words I already know. Also, I just love seeing progress bars fill up! I feel like this wouldn't be too difficult to implement considering the fact that if I browse the contents of a list, it already shows the words I know and banned. Thanks!