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From my experience from a cheapo machine from Walmart, to 870, to Rocket and to Slayer, the main difference on high-end machines is consistency and ability to deal with particular roast/beans.
Some beans needs a particular grind to really max out its potentials, but very often, we either don't have the grinder to do that, or the espresso machine gives too much inconsistency. So you can have one great shot to a shitty shot right after.
High-end machines have very well controlled components. The pressure is consistent, the water flow is consistent, the temperature is consistent... so on. You just take one guesswork out of the equation.
So, between shot to shot... there should be minimum difference (if any) between the shots. And you pay a great deal of money for that level of consistency.
After all, once you get a tool that you are comfortable with... and this can be a machine or an aeropress or whatever... the most amount of money is actually spent on beans. And I'd hate to waste even a gram of beans if I was using some good beans and more so if they are expensive.
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Nothing for now
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