I'm using React on a toy project and I'm pretty impressed with it so far. Once I got a reasonable environment for editing and processing JSX things have progressed pretty smoothly. Until web components hit this seems like the best option. The library mentioned in the OP seems interesting but I think I'd prefer to stick with React even if only for the much more established community. In the long run I think consensus counts for a lot because most things can be fixed if enough people are willing to chip in to fix them.