Hi Phil,
As Robert says there is very little diffrence on the cylinders you use. We use either a 7kg calor butane or the camping gaz 907 and the pressure is not apperently diffrent, just different regulators.The only reason I have not mentioned propane is I have not got a regulator for that type. As far as the Cadac goes I could not agree more, a fantastic piece of kit( even though it weighs a fair bit).
Rob