A friend keeps going on and on about their Nespresso machine. I tried some, and it's not bad. I used to have a Keurig ages ago but quit using it. Normally, I grind and brew my own coffee. I like the idea of the convenience of the Nespresso and the Aeroccino milk frother. Any of you Nespresso users? Is it worth the investment? Happy with the quality of the coffee? Thanks, guys!