I've just acquired my first Sigg Firejet with another on its way from @Harder D. Soerensen. Initial impressions are good. I love the design aesthetics, it's pleasing to the eye to unfold it. It appears straightforward to service, nothing too fiddly or tiny for my fingers. It burns well enough if not with the ferocity of my Optimus Nova. The neat integrated air restrictor. A few minus points are the friction fit top on the burner head that comes loose, the plastic pump feels a bit flimsy (although in fairness it is working well after a lot of use) and the dribble of fuel when you remove the fuel pipe from the pump (the previous owner directed this into his zippo lighter as he exclusively used white gas which I thought was clever). I'm running it on Aspen 4 in these shots.