I still have my Svea 123 purchased in the early 1970's and last I tried it worked perfectly, even with who knows how old gas in it.
I use my Optimus 111B with some regularity. It is heavy but it's like a blowtorch. You may recall it was the standard winter stove when you needed to melt lots of snow for water.
Last summer I took the 111B kayak camping with six people, a very large and tall pot, and two dozen ears of corn. It got the big pot boiling and we cooked lots of fresh corn. We also cooked a zillion eggs and bacon for six in a large frypan (cast iron?), as well as lots of other non-UL meals (one benefit of kayak camping with Boy Scouts).
It starts first time, every time, and roars. I recall the roaring sound was very comforting years ago on winter trips in the Adirondacks when it was 20 degrees below zero F.

