My opinion is personal, but I confess that I have tried many systems "Piezo" for acoustic guitar, and I put it before all others! I chose this model because I have a Highlander on a National (biscuit) and I'm delighted.
The microphone is coaxial (like a cable), so it takes the sound 360 degrees, making the sound less harsh and more natural. In addition, the balance ropes is perfect because it captures the entire length, and is "embedded" in a groove under the bridge saddle.
As for the preamp is the "Class A", the signal to noise ratio is very good! (Not a fart breath even at a high level). The output level is high, it may even attack a console, even if good things always optimizes DI!
The price / quality ratio is excellent, because it finally has a sound that approximates the instrument, and who can play at high volume. (Hey, that's not 2 KM84 before the guitar, but it goes without saying!). Short, but good ...