"It tasted better than coffee I've tasted on $20,000 or $30,000 espresso machines" (40:20)
At this podcast:
Veteran coffee guru and robotic crusader Liam Wilkie is interviewed on the super interesting https://www.facebook.com/Jonathonsci...-356414814159/ Melbourne Coffee Culture podcast and opines extensively about Decent Espresso (starting at 34:20), as well as many other pro topics. Well enlightening and worth listening to the entire thing.
FWIW, we're using a 1.2 meter long stainless steel "thermocoil" to heat water.