Loving this machine!  It certainly takes some research and practice to start making good espresso shots, but I love that there is so much control for the end user to adjust settings.  My recommendation to users - weigh your coffee beans BEFORE pouring them in the grinder - this way you will always grind the right amount, and you won't be left with excess beans in the hopper.  This has two benefits: 1) prevents that coffee from going stale/extra exposure to air, and 2) allows you to switch between different types of beans with ease!