I used a vocal condenser microphone in a recording studio while recording my first CD, and the quality was unlike anything I had ever encountered. I had been using cheap microphones for stage performances that often generated feedback, and sometimes even the sound manager at the venue could not get the correct balance between treble and bass.
The condenser mic made my voice sound crystal clear. It also picked up on the little inflections in my voice. Any time I had a slight growl or a breathy sigh, the mic caught it.
I was so happy with the way the recording turned out. I knew that a condenser mic would not work as well on stage as it would in a studio, and that was the only thing that kept me from buying one for myself.