If you have never had a portable ice maker, you need to understand that they are not refrigerated
Once the ice is made and falls into the ice bucket, it starts to melt. The unit is insulated so the ice lasts for hours and what melts gets reused to make other ice cubes.
Portable ice makers make ice best when the air temperature around the unit is cool, as in an air conditioned room. Outside in the sun, the ice will take longer to form and melt faster.
It is also best if you use cold water rather instead of room temp. water.
I usually use cold water, keep the ice bucket out of the unit and then allow the first few loads of ice to dump down into the water to help keep it cold. When the ice in the water is gone, I allow a few more loads to dump down into the water.
My old ice maker, a different brand, had a small metal bar that would get cold when the ice bucket was full and the unit would stop making ice. After you dumped the ice out, you would have to keep your finger on the bar to warm it up before it would start making ice again. This unit has a light sensor. As soon as the ice is not blocking the sensor, the unit starts making ice. That's a really nice feature.
I have not had this ice maker for very long, and in fact I bought two of them, but I had both of them making ice for several days in a row to test them out and they both did well.