This really improved the quality of our vocal recording. We are working on our second CD doing much of our recording in our church, and by using the RF-X we get great isolation for everything. We use it along with a Spark for most of our vocals and have also experimented with the RF-X on guitar, and acoustic piano recording. Definitely a big difference. The portability of the unit is also a huge plus. We can put it wherever we need it! Small item, small price, LARGE difference!