I admit I was reluctant at the moment of the purchase.
I use this on a wide range of piezo - amplified instruments (kalimba, flute, acoustic guitar) and it has never disappointed me.
The quality of the sound is superb, I didn't even know that I could get that sound out of a DIY piezo mic.
Pros:
versatile, rugged, top quality sound
Cons:
only 48v phantom alimentation, price could be percieved as too high (but actually it isn't, totally worth it)