I had the misfortune to purchase an Apogee Duet. Google, or search these forums, for "Apogee Duet Noise" or "Apogee Duet Hiss" to read about the problems I and so many others have had with this unit's self-noise when recording. Easily the VERY WORST AUDIO INTERFACE I have ever encountered. I also discovered, in my misadventures with this unit and the company that makes it, that their "maestro" software makes surreptitious network calls over my internet connection, without my permission or knowledge. using Little Snitch, I saw that the "maestro" software phones home everytime it starts up. And since by default it starts up everytime you boot your machine, that means it is phoning home every time you boot up. Really annoying. Personally, I will no longer be doing any business with this company, other than trying to recover the $500 I threw down the toilet on the Apogee Duet. In my opinion, Apogee is a very shady company, who makes defective products and doesn't fix them.