Piezo Bass Bridges?

[abarson]

I'm aware of the following bass guitar bridges that have built-in piezo saddles:

1. Schaller 3-DP4
   
2. ABM 3704-P
   
3. ABM 3710-P
   
4. Graph Tech PN-8370-B4 (made with Hipshot)
   
5. RMC Pow'r Bass
   

I would like to get feedback from people's use and comparison of these bridges, what they liked/disliked, ease of installation and setup, etc.

I'd like to know what you think of these as standalone pickups, or in combination with a magnetic pickup.

Also, if there are other piezo bass bridges that I should consider that aren't on the list, let me know.

Much appreciated!!

[Cerb]

Check my Talkbass reply.