At first glance, these new cylinders look good- less weight-half the weight of traditional steel cylinders, more gas-10kgs as compared to 6 or 7kgs depending on what you use, propane or butane - if you can fit these things in your gas locker of course. I would certainly consider them, they only do them in propane though - Swift and Bailey are looking at them and promise that they will ne able to fit them in all new models but does anyone know a bit more about them or have you already got them? BP say they have had fantastic response to them. www.bpgaslight.co.uk