Much appreciated. I actually had the link to those chargers open already. So I'm glad my initial decision was a good one.
The dispenser I was looking at is this one http://www.amazon.com/gp/product/B000SSQQ1Q?keywords=whipped%20cream%20dispenser&qid=1444139995&ref_=sr_1_16&sr=8-16 But if you found the other one to work well then that works for me. I'm always happy to save a bit of cash. How long do you hit it for before you find it needs a rest to cool down generally?
OP notwithstanding, it's not a made up concept. https://www.amazon.co.uk/Impeccable-Culinary-Objects-ICO-Whipper/dp/B000SSQQ1Q/