Roger, thanks for perfect timing. The stove arrived last week just on the day I was leaving for a four-day trip. It was an opportunity to test it a bit, although we cooked mostly on fires.
The stove is very nice and light and the attention paid to some construction details is really amazing. I like it a lot.
However, I've encountered one quite serious issue: I was screwing the valve onto the canister and although the safety valve lever was in the "off" position, the gas started to leak. At first, I wanted to tighten it quickly to get a seal, but the leaking only increased so I disconnected the canister. It turned out that the brass pin was stuck in the "on" position, regardless of the position of the lever (which I previously turned to "on" for storage and switched to "off" just before use). I found that this can happen because the white body of the safety valve moves horizontally a couple of millimetres and when it is pushed into the valve assembly, the eccentric region is not aligned completely with the pin (see photo). As a result, the pin is caught on the edge of the full-diameter region of the white part, being engaged regardless of the position of the lever. Pulling the white part out a bit fixes the issue for the moment.
Since then, I was checking the pin before every use, and this problem occurred again once or twice. The design should be updated, most easily by making the eccentric region a bit wider to accommodate the possible shift, or by preventing the shifting movement by some other means. I will fix that myself on my stove; I will probably insert a spacer into the valve assembly so that the white part can not be pushed inwards any more.
Additionally, I would prefer to have the on and off positions of the lever to be left and right (with labels on the sides of the black block) rather than up and down. As it is now, the lever in the off position points outwards, and because its quite thin and sharp rod, I'm turning it down when I pack the stove. Being able to pack the stove as is would be nicer, because the stove will be ready (in off position) for next use.