We use our Yonanas twice a week for approx 30 min a day. It works well for us, but you have to make sure the fruit is slightly thawed. If it is frozen solid, it will not feed through the chute very well. So far, it is still working really well.
In feeding the frozen fruit into the Yonana, it's important that you not force feed it. By that I mean don't press too hard. After you use it for awhile, you'll develop a feel of how hard to press. Don't be afraid of it, it can take what you give it, especially if the fruit is left at room temp for a few minutes.