Tone - Nothing "
light-weight" about that beasty.
Mike - 25 / 27 - its a size thing I think . . . . or maybe a weight thing . . . . . maybe?
I tried the spirit burner and got so frustrated with the length of time it took to cook stuff, I nearly took up drinking the meths instead of burning the stuff
Have used the gas burner for years - it's wot Lowflyers set up was when I borrowed it. So I'd say if your going the whole Trangia route, then get a gas burner.
By the way, Trangia do a dedicated kettle for their kit - heats up in no time due to having the heat hitting the bottom and all the sides of the kettle due to the way the kettle sits within the cooking set. Its also an "extra" with most trangia kits
Just my ramblings
Steve T