In reply to K.W.:
got one. f*cking brilliant.
as powerful as any of the others but collapses smaller, is quieter, waaaay safer (no real priming flare), waaaaaaaaaaay easier to use.
issues:
takes a fair bit of pumping as it demands more pressure, takes one or two goes to nail the function, the fuel line is so flexible (so it packs down small) it needs a bit of care to pack.
not sure of price in the UK, but in japan same as the competition.
after 12 years of XGKs im converted to this thing.