We have a
DeLonghi fairly standard espresso coffee maker, which is about 5 years old, and I am waiting for the day when it gives up. The HP pump is the weak leak on many of these machines as far as I can tell although you can buy replacements, and we did notice ours struggled following a descale, so as we only live in a medium hardness area I don't bother any more.
As to the quality of the coffee you get from these machines, my experience is that it is entirely down to what coffee you use. We like Italian fairly dark roast type coffee, and used to get our coffee from a small specialist shop in Wallingford but can't get there any more, and so tried most of the supermarket coffees and found most of them to be very bland often not suitable for a machine and so in the end have settled on Lavazza Rossa which suits the machine, has about the right ground size,
usually widely available, is consistent, and is relatively inexpensive compared to some coffees out there.