With any portable ice maker that you buy, you should know that the ice is usually hollow in the middle to be able to make it quicker and use less water. Since there is usually not a water line run to the icemaker, and they rely on the supply in a container (usually one gallon) they try to make the most ice with the least water.
Portable ice makers are usually for putting ice in drinks, and not as much for making good ice to keep in coolers if that is your intent.
Portable ice makers are usually for putting ice in drinks, and not as much for making good ice to keep in coolers if that is your intent.