I was really glad that I found this toolkit just before we released our app. We were previously relying on Google's other 3D viewer (because of course they have two), model-viewer, embedded in a web view.
Thermion has solved a lot of the problems we had with the old web view solution, (performance issues, load times, transparency, etc.) so I'm happy to contribute back to the project in any way I can!
you have to spend a lot of time deciding which state management to use theres a lot of packages you have to choose from and it was exhausting
this looks like it could produce smooth 3d experience but i ended up using babylon.js with electron