Hey swannie
Thought i would share my experiences with this cooker with you i bought my first one of these back in 1994 after a 3 month trip and having to clean out jets and gauses in my twin burner gas stove ( contaminated gas)
I still have the two burner and 99% of the time use unleaded fuel the occasional tank of shelite to burn carbon build up i have never had anything brake on it they are well made and can take a beating as said by others when using both burners u loose a slight bit of performance but will still work and do the job in my opinion it boils and cooks quicker than gas is simple to set up and use( you dont need to pump it every time you use it like most do).
As i do most off my cooking on the camp fire and single burner cannister ones while on the tracks this is more used around camp and when it decides to rain half way through cooking a meal.
About 4 years ago i bought another one as it was an offer i could not refuse they normally sell from 250 to 300 so that price at rays is a steal as for how long the 1 litre will last i have never really taken any notice normally just fill b4 i go away if its a longer trip just fill as needed even at a sevo with funnel provided or bottle of shellite.....
Anyway enough ranting from me hope this gives you and others some use full info..
Cheers
BUNDY