Coincidentally, I just got a knock-off Soda Stream from Phillips. It's over $150 cheaper and works 2x-3x times better. I wanted to build something similar for a homemade soda bar concept, and discovered how truly cheap it can be to make soda and carbonated water at home. I was shocked at what a simple concept it is, and how much of a profit these sodas water companies make. Phillips even charging $50 for their system is a total rip-off.
Truthfully, I think the increase in quality in the Phillips machine is due to fewer parts is an "exception that proves the rule" as these in-bottle carbonators seem to work better with fewer parts. It's just a pressure hose connected to a co2 tank. Literally, all of $6 if you were to build one yourself from parts on Amazon (or $3 if you got he Alibaba route)
I truly believe that the fewer parts the better in any DIY or commercial product due to the less chance of a failure in a part if there are fewer parts. This works fantastically for the "lower quality" producing companies, like Phillips.
My inventive and engineering entrepreneur friends and I call this "fewer parts the better" concept, a "Murphy's law compensator" as the fewer parts there are, the fewer parts that can statistically "go wrong"
I lived in both 'French Canada', and France at one point in my life.
In my experience, they all consider themselves the best thing France ever made and the other side are the equivalent of "rednecks"
To be fair, they both can be right.