Instruct: Classify the given Amazon review into its appropriate rating category
Query: Replacing the CO2 cartridges has been an expensive adventure in waste - the gasket in the cap was slightly mis-aligned ...

My initial enthusiasm for the product has been tempered by the realization that the quality of the construction is just not there. The plastic cap is cheap and will certainly not last. Replacing the CO2 cartridges has been an expensive adventure in waste - the gasket in the cap was slightly mis-aligned which allowed the gas to vent rapidly as soon as the cartridge was tapped. I burned through a couple before I figured out exactly what the problem was. Since this is a relatively new company, it will be interesting to see if they can learn from these early mistakes and improve on the design. If they can't do it soon though, I'm betting a competitor with a better design and superior materials will bury them. It's a great idea, especially if you live in a city like mine, with a lot of craft brewers whose beers are not available in stores. The demand is definitely there.