It's been eight years I use this mic for my classical guitar and I am Fully satisfied.

Advantages:
<ul> It fits anywhere (any guitar with the bridge saddle is removable, or other instruments of its kind, even mandolin or dulcimer!)
It is not too expensive (less than 100 Euros 8 years ago).
It has a button / slecteur volume.
Comes with a small clip to attach the cable (soon to snatch the microphone in an accident.)
</ul>
Inconvnient
<ul> Fragile !!!!! </ul>

In short, an excellent microphone to the sound perfectly neutral and you will make use, as long as you take care.