Pros:
Much more accurate to the acoustic sound of my violin than the pickup I had before (which was itself a serious professional piece of kit!), requiring only very fine tweaking of EQ from the desk for optimum tone, and can be used even in front of the main PA speakers without feedback.
Cons:
Shaping and fitting the new bridge is a pro luthier job so that needs to be factored into how much it really costs. Like any piezo pickup, doesn't really capture the resonance of the body so it will sound 'dead' without some reverb added at the desk.