Espresso is are more sensitive to the quality of the beans being used and the evenness of the grind than the machinery. Personally, I don't like most coffee shop espresso - beans are roasted so much they taste burnt and chemical, and any character from the terroir has been lost. For similar reasons, I think most capsule coffee is disgusting.

I get my beans whole, by subscription, grind them myself just before making an espresso. Another advantage of starting from the beans (apart from something that is actually pleasant to drink) is that you can select lots of other brewing methods, whether it's aeropress or moka pot, cafetiere or filter, with different grind levels as appropriate.

Also if you like milk-based coffee products (where the taste of the coffee is far more diluted, and the quality is less relevant), having a steam wand is handy and much better than any attachment I've used on any coffee machine, including Nespresso, and other much more expensive models that do bean to cup.