Get one, they are so much fun, make you giggle inanely every ride. Ideal fir commuting, switch off the motor if you want to get fit! Switch to turbo mode if you're late and don't want to arrive all sweaty....
Supermarkets do tend to sell kits off cheap, after a few months.
Then it doesnt matter much if it goes a bit wrong.
Most supermarket kits will make a very acceptable brew.