Rhonda, I am glad you have had a great experience with Saeco! They make some great machines and have treated our customers very well when we have had to refer them. As far as the difference between the Sirena and the Vienna: The Sirena is a semi auto, while the Vienna is a Super Auto. Like you said, your next machine will grind the beans for you, and that is a key feature in a Super Auto machine. The best thing about any super auto is the consistency. You can bet you will get a solid shot time and time again, as it takes all human error out of the equation. A Semi Auto is going to give you more freedom to pull a great shot, but it requires a lot of time as you already know.