That's great, but 1.3mb as a baseline is just too big for most common DOM manipulation type of use cases. You want your UI drawn within a couple of seconds or the experience becomes bad. Even if they were able to cut it in half I'm not sure I'd be comfortable using it. I'd really want to profile and see how fast you can get to interactive using something like this.

Now for heavier applications like graphics or video editing, this would be fine to use.