zzzskizzzit's like a shaker, it's very nice to have if you have, and it will enhance your drinking experience. but you don't need it but if you have $70ish throw around I'd get it.
hahah its $70??? its a glass ball with hole in it, a pint glass and a tea candle. you could get the glass ball at a craft store (think christmas decorations), and i bet you already have a glass and a tea candle.
other than that, you need a straw, and some spacers for the mouth of the cup to let heat move around the globe. nothing is pressurized, nothing is automated, nothing is even graduated. the "equipment" here is so plain, its literally worth next to nothing.