I have used 3000 Series wireless equipment for over 10 years. I would rate the sound quality and features as superior. I have just installed my first two 4th Generation units (a handheld and a belt pack), and I have to wonder who designed the physical characteristics of the transmitter units. In the 3rd Generation, the power was easily accessible without being at risk of inadvertent turn-offs. The power switch was also separated from the programming controls. In both the handheld and belt pack 4th Generation transmitters, the transmitter must be opened (as if changing batteries) in order to access the power switch. This makes use by an occasional user or "turn-key" operation much less desirable. I have no doubt that the features and audio performance of this unit would rate a "five star", but the user needs to be able to turn it on...thus, "three star" overall.