The Breville Dual Boiler is considered a good value for its price because it offers more features than espresso machines that cost twice as much. The speaker emphasizes that dollar-for-dollar, the features provided are exceptional.
The significance of the 58mm portafilter size is that it's a commercial-grade size. This makes it really easy to find a wide variety of accessories for the machine.
This video is a review of the Breville Dual Boiler espresso machine after six years of ownership. The speaker discusses the machine's enduring value, its features, and personal modifications or "hacks" they've made to improve its functionality and aesthetics.