I installed this preamp on my 2008 German made Warwick Corvette $$ (double buck) and it really woke my bass up. The coil switches provide a HUGE change in the sound now. The stock preamp was ok, but this is on another level. I can dial into a RHCP or Tool sound with ease.
Installation was pretty straight forward and Nuno offered to help me figure out the electronics after giving me some tips to get it installed.

Literally, it comes in a box small enough to fit in the palm of your hand. A compact design that should fit any cavity,all with no solder connections on the pots. Very easy install. The filter for each pickup combined with the blend control provides a wide variety of tones including some "in-between" tones not possible with a standard controls. The one thing I would suggest is to install knobs with an easy to see indicator. This helps dial in those sweet spots quickly on the fly.