Product review (2 stars): Tiny ice cubes that aren't totally frozen
I don't know how well it compares to other portable ice makers but it has some significant flaws in its design that make it not worth using.

The ice "cubes" are very small and mostly hollow. They aren't really even ice cubes, more like tiny ice cups. There is little ice volume being produced compared to a built-in refrigerator ice maker or an ice cube tray.

The ice cubes are wet because the unit isn't refrigerated. This is a problem even if you remove the ice from the ice maker immediately after they are produced. It takes so long to make ice that you really have to make it in batches and store the finished ice in the freezer. Since the ice cubes are coated in liquid water, they will freeze together into a single mass once they are put in the freezer. It can also lead to a lot of water dripping on your counter or on the floor.

The ice production is very slow and the collection bucket is very small. It will take about an hour for the machine to process a full tank of water and produce about three tiny buckets of ice. It's just not practical.

You can get higher quality ice with less work using traditional ice cube trays. I can't find a practical use for this machine.