Easy, easy and easy with flexibility in selecting how you want it to brew. Only problem is if you attempt to accidentally brew without the water tank installed, you have rendered the unit permanently inoperable. It will no long turn on. Keurig could use a different thermostat with a reset function but they don't.
This is the third Keurig Supreme that I have had. The other two were replaced for the same reason. Keurig master switch would not turn on the coffer maker. The people who took my calls were extremely helpful and sent out replacements the same day
My new Keurig failed to turn on after three months. Customer service asked to me to do a couple of simple troubleshooting steps. When they failed to work, there was no hesitation. I was told they were sending a new, identical brewer to me. Within two weeks, it was here. I commend Keurig for taking care of my problem quickly and easily.