Unless they installed some extra caps to filter certain tones it will let you hear exactly how you sound. I doubt they would do something like that because it would really defeat the purpose of using this thing. It's a very simple circuit. Some guys have the idea their demodulator is a piece of junk and they really sound better on the air. Trust it and don't be that guy.
And use a quality set of headphones.
And use a quality set of headphones.