I bought the unit about 2 weeks ago and have been loving the quality of life improvement while recording and listening to music. It was only because I had to mix something for a client this weekend that I noticed something (after about an hour of trying to figure out why the trumpets in my mix were distorting): the unit was inducing distortion. I only realized this because, after turning off/on most plugins in my mix to no avail, I decided to plug the headphone jack directly in the interface output, and presto: no distortion!
So, I would give this a higher rating, but if you're gonna be using this for mixing or mastering (which I guess most people will), then don't buy it. No matter how much of a good deal it seems, it's a monitor controller that distorts the output, so it's not worth the money. In fact, I'm returning mine.
*Too long, didn't read* I realized that the unit induces distortion in your mix, so it's not worth buying.