Which Smoothie Makers are the Most Convenient to Use?

I want a really convenient way to make myself a quick and healthy breakfast. I am thinking that smoothies might be the best option since the kids and I all like them so I wouldn’t have to make something different for everyone. Can anyone tell me which smoothie makers are the most convenient to use? I want easy cleanup for sure. If they are easy enough to use the older kids might even be able to make their own smoothies if they want a snack, which would be nice. I always like to let them do whatever they can on their own, it gives me less work to do.