4 stars instead of 5 only because this thing won't tune your guitar or carry your amp. I use this solo, in a duo with a bass player, in a trio with drums and bass. I have a regular gig at a medium sized club that is basically one large room. I use it through a Pyle Pro self contained Pa into which I also plug my Martin GRP elec/acoustic. The sound quality is excellent. The volume seems limited only bny what the Pyle Pro will put out. I would have no hesitation using this for bigger rooms with a full band and PA. I haven't heard a hint of feedback and the on/off switch is a plus.