Competitor SodaStream, in comparison, carries Pepsi flavors including Starry, Diet Pepsi, and Mtn Dew. The differences between the Thirsti Max and the original Thirsti model are trivial.

SodaStream’s latest desktop carbonator is the enso, designed by none other than product design supremo Naoto Fukasawa. A far, far cry from the plastic-sheathed SodaStreams of old, Fukasawa has given ...