I have an old Jetboil. I use it mainly in the summer, working for companies that provide expeditions for kids abroad.
It is brilliant, don’t underestimate how useful it is to get out one bit of kit and get boiling water in seconds. First thing at every camp, Jetboil on, coffee made, help kids get tents up. Another coffee, then my kit to sort. No faff, I can cope with the weight and it makes my life better right then.
Never ever use it in the UK, but its like all kit. Find where it / or if it fits in well for you and use it then. When it breaks Ill get one of the primus ones, but do like the thought of pairing my Spider with one of those GSI kits,