https://universalstylus.org/goodix-develops-open-active-stylus-solutions-for-the-education-market/ So basically bunch of companies are still at it with the USI (Google, Goodix, Waltop, SIS etc.) which I guess now is positioned more as an open pen protocol than a "universal" one, but hey! Progress is progress I guess? But more importantly, Goodix version of USI digitizer and pen are shipping in actual products! Bad news is that Goodix pens apprently sucks ass atm... I guess most of the Teclast's Surface Pro clones are using Goodix digitizer and pen, as is the new Celeron Y version of the Onemix Yoga 1S. You can't blame the crappiness of the pen on the protocol I don't think. For instance, there are myriad of pen quality within MPP, from $25 no name brand ones to $100 Surface pens. But I really don't know what USI currently brings to the table at this time other than it is an open and free standard. Yay? I guess for now, when even the lowest end MPP digitizers are too expensive for your BOM, you go with USI digitizer and pen... Anyone with either Onemix Yoga 1S or Teclast X6 wants to tell us about the pen experience?