So far it's perfect.  I bought a 1 cup bottle of whipping cream.  I cleaned the canister and dried it thoroughly.  Then I put the canister in the fridge over night.  The next day, I put the cream in a measuring cup, added 2 tablespoons of granulated sugar and a splash of vanilla.  I stirred slowly for a minute, let it sit for a few minutes and then stirred slowly a little more to ensure the sugar was all dissolved.  I then poured the mixture into the canister, put the cap on, put the cartridge in it's metal holder and screwed it on.  You can hear the hissing as the gas in the cartridge is released into the canister.  I then let it sit for a minute or two.  Then I shook it, until it felt like there was no more sloshing.  I counted 10 shakes, but I counted, 1 up, 1 down, not 1 up then down.  I then put the dispensing nozzle on, turned it upside down and pushed the lever over a small paper plate.  Voila!  Whipped cream just like my mother used to make with a stand mixer, a metal bowl kept in the freezer overnight, and admonition a to various daughters to not screw it up and make butter.  I can't wait to try various flavors of whipped cream.