I opened my Ninja Thirsti drink system this afternoon.  The instruction manual was very easy to follow & set up my machine. I was pleasantly surprised with how easy it is to make my own sparkling water.  I like that I am able to choose my level of carbonation.  My Ninja Thirsti came with the CO2 cartridge & a removable water reservoir The Ninja Thirsti seems to be very sturdy and well made.  I love that I am able to choose the level of carbonation for each drink.  So very easy to use.  I would definitely recommend the Ninja Thirsti to anyone that likes carbonated drinks.