It's one of the featured items on Amazon Prime Day, but one grandmother is warning consumers to stay away.

The Opal Nugget Ice Maker is the device that claims it can give you the popular "Sonic ice" in the comfort of your own home.

Most ice cubes made by your refrigerator or in cubed ice trays are hard and can hurt your teeth. The Opal Nugget Ice Maker gives you the ice that is made from compressed flakes rather than a solid block, which is why it's so appealing.

As a matter of fact, it's so good that people drive to Sonic Drive-In restaurants (at about 2.79 per 10 lb bag on average) just for the ice —which was the inspiration behind the machine in the first place.

But some people (one grandmother in particular) believe that the machine is a waste of money, and they've got a good point. The machine is discounted 20% at $499 and available as one of the featured items on Amazon Prime Day.

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So, does the Opal Nugget Ice Maker make fiscal sense? Probably not, but if you're balling, or you crave Sonic Ice at 3 a.m. this could be worth picking up.

Would you drop $500 on this machine, or is the trip to Sonic good enough for you?