I have a Delonghi. It works just as well as my mate’s KitchenAid. Doesn’t look anything like as nice, and actually I’m on my third in the period he’s had the KA. I’m still ahead on cost…
The difference between the coffees labelled as filter etc is the grind. You need a much finer grind for espresso so that you can tamp it good and solid. Filter / cafetiere grind is so coarse that the water goes straight through. I always grind my own, and do it fresh.
IMO it’s worth spending a lot on a proper grinder more than on the machine – 15 bar is 15 bar whether the machine costs £60 or £600, but a cheap grinder will wreck the coffee before it gets near the machine. The Kitchen Aid Grinder is worth the money.
Finally, I’ve yet to find a decent coffee at a supermarket, yet the cheap and cheerful beans at Costco makes a really good cup for everyday drinking.