My new project hollowbody guitar needed a pickup. The cheap piezos I tried didn?t impress me, so I remembered the TrueTone that had been lying in a drawer for a couple of years. The guitar has an offset soundhole and the pickup housing was too high to fit under the strings. 
So I thinned down the wood housing to 11 mm, enough to go clear of the strings and mounted it with double-sided tape in "neck position". 
The sound is clear and more acoustic than electric. Not bad at all! 
I tried a small guitar amp, but found it a bit too bright, it sounds better to my ears through my bass amps (Fender Rumble 15 and 100). After all, it is a single-coil pickup. BTW I am using flatwound electric guitar strings. 
 
Pros: Clear, acoustic sound 
 Cheap 
 Easy to fit if the soundhole is the right size. 
 Easy to modify, can be stained to suit your taste after 
 sanding 
Cons: The fixed cable is stiff and feels cheap. 
 Low output