A couple of years ago I got a Presonus MP-20 microphone preamp. I have always liked the way it sounded (or did not sound on acoustic music) lately I started hearing some "problems" with the unit. (high end sizzle and what sounded like sibilance) I checked the unit out and found that the harmonic distortion was higher than advertised and called the company to get an RMA to send it back. The company was very easy to deal with and the unit is on its way to them. I was just wondering if others on this forum have used the MP-20 and what your feelings were about the unit. Thanks in advance.