Sound wise it is great.
The mini-XLR to XLR adapter is made of metal and the microphone casing seems to be metal as well.
Provides a much more natural sound than a piezo pickup on a classic acoustic guitar. Noise levels seem to be okay, although I've tested it in a place with some background noise, making it hard to distinguish from any noise added by the microphone.
The only complain I have for it is the support for the guitar, it doesn't add noises and secures the microphone well, but the plastic clamps are really tight, I ended up breaking one as it wasn't perfectly aligned with the microphone casing when I tried to connect them, so be careful when putting it together as you need to do what seems to be unreasonable force.