I love my Opal nugget ice maker! The ice is perfect and ice is made very quickly.
However, when we first received the ice maker it made a terrible noise after being plugged in for several hours. It sounded like a chain saw! It was so loud,  we had to unplug it and called GE for assistance.
They sent us a new ice maker and it did the same thing. I eventually figured out if I Unplugged it and filled it with more water it would eventually stop. After a couple days of  the noise starting up at least once a day it finally stopped and we have not heard it since. 
That is why I can’t give the ice maker 5 stars. However, now that the ice maker is quiet I am very happy with it!