I did, it's just a homing grenade that shoots at the enemy while it slowly flies towards him. Then, a minor explosion on contact. Meh
As often, legendaries are quite occasionnal and very situationnal-specific gear It may have a use for a specific build, maybe for Moze ? I don't play her, but if I got it right, she's the grenade-loving char, right ? Maybe the bullets it shoots can benefit from skills, etc ? Run some tests !