Great review but with one inconsistency. Under the maintenance section, you mention an M.2 slot, but list the lack of M.2 as a con in the summary. I don't see an M.2 slot in the photo, and I think there is not one.
Anyway, just bought the European version of this notebook for my wife, since it ticked all the boxes of what she wanted in a laptop (smaller and lighter than her current 15.6" notebook, touchscreen, backlit keyboard, quiet) and has generally favorable real-world user reviews, unlike the other notebook I seriously considered, the XPS 13.
The only thing I can comment on is the emissions, and being very picky about that sort of thing I have to say the UX303UB is astonishingly quiet, considering the presence of two cooling fans for the CPU and the video, while also remaining quite cool. I do not hear the electronic noise you mention even with my ear right up to the keyboard, except in certain cases when the SSD is working (e.g. installing programs). I would attribute that to Asus' unfortunate choice to use a cheapo Hynix SSD, which is a shame in an otherwise well-designed and built notebook.
To be fair, the installed SSD has decent enough read/write speeds (about 500/400), but at this price point Asus should have gone with an M.2 SSD or at least a higher quality SATA SSD. Doubtful it will be an issue for the wife since she's not a power user who would be putting the SSD through its paces, but if it is then I'll open it up and install something better.
So I would say user mileage may vary on the emissions, but the rest of the review seems spot on.