It been useful to help me find a the disc, however, I’ve used it with a light blue see through disc, and I’ve been lucky for it to land the right side up each time. It’s good enough and certainly helps to find the light blue disc that I struggle to find just as it’s coming to dusk. For me the upgrade for 5 stars would be at least one of the 3 LEDs facing down so no matter the disc orientation, they’d be visible