In reply to UKC/UKH Gear and others, including Harden Climber:
Good review of a really good, well-designed and well-made, reliable stove that I've used on some reasonably gnarly solo, multi-day treks since 2019. For me, reliability is more important than absolute weight.
I have been pleasantly surprised by its fuel efficiency. It significantly outdid my own (admittedly conservative) calculations on how much gas I'd need to carry for a six day trip. Piezo starter is still going strong, though I carry a firestick, too.
Stability? Fine. I use mine with the Soto Thermostack pot set (https://www.climbers-shop.com/camping/pots-and-pans/soto-thermostack-combo-...) which is designed to sit on the pot support and, again, have been pleasantly surprised by its stability (on both squat and tall 250g canisters).
CO? Well, when I was thinking about buying one I had in mind a friend who nearly died of CO poisoning, and asked the vendor. I can't remember the technicalities – there's a good article in the AJ a few years ago by said friend who explains them – but the short answer is, iirc, that much depends on the shape of the burner ring and whether it allows there to be unburnt gas. The Windmaster, I was told, was good in this respect. I have used mine in a not very well ventilated tent – it was very windy; there's a limit to how wind resistant the Windmaster is – and am still alive (I think).
Post edited at 22:35