I don't use one myself, I think they're very expensive, especially if you only buy it for occasional use.
But the flavour from fresh ground beans is much more intense than ready ground, just like a coffee shop coffee is, but I still buy ready ground for easy breakfast use. I don't do any of the espresso, cappuccino or whatever else coffees that makes a lot of the cost of coffee machine go through the roof. Just strong dark coffee as it comes with no faffing about with milk or sugar or anything else.
I'd be interested in one myself, if amyone makes a simple long breakfast coffee only one.