I bought the Shadow SH965 NFX-B Double Bass PU 2012 and think it works really great.
I read a lot of reviews before and was looking for a PU which sounds very naturally and well balanced for slapping, pizzicato playing and while playing with a bow. Because the PU at the bridge sound to bassy while playing with bows, I bought the Shadow SH965 NFX-B Double Bass PU.
The montage is quite simple: Relaxing the E- and A-string will get the bridge loose enough to geht the PU under the bridge, same procedure at the other side. Don't relax all strings at once, or your sound post could fall! The rest is fixed with the enclosed screw to the tailpiece. But you have to fix it really tight, so it makes no sounds while playing!
I use it not as often as I could (mostly I play without my amp), the battery still lasts. The potis are both set to the middle position, I don't use them. I only use the potis at my amp.
Though I read, there is a new system, especially for slapping sounds, I would buy the SH 965 again. It works very good, is dependable ad makes a well balanced sound. While I'm not using any amps, I don't remove it, it always stays at my bass!
PRO TIP: Before I start, "Wrapping a little masking tape round the pickup elements to give them a rougher surface really helps to stop the bridge slipping around when setting it up and dosen't affect the sound."
Bought to replace an old worn out piezo pickup, it may not have quite the same detail of sound as the real pro set ups but its a nice stepping stone, and can be installed at home without tools.
It gives a big warm tone all over the instrument and the little pre amp thing gives it enough oomph to be heard with a band when its plugged straight into the PA. Having a volume wheel to hand is also nice if you're switching instruments.
Just little niggles, a cover for the battery would have looked neater and the colour is a little tacky, but thats nothing mounting the box facing backwards wont solve.