I got the slightly smaller BK03 in Japan a few years back. I travel with it along with a mag-safe battery pack with a built-in kickstand, so that it forms a lovely typing setup even on a small cafe table.

An unexpected bonus is that the setup short-circuits a lot of reflexive app-switching and idle scrolling. With the phone propped up, I have to actually reach for the screen, so my thumbs don’t just wander from typing to home/app drawer gesture.

I found the BK03 too small to comfortably type on.