I have a LOT of Cajun parts in my CZs (adjustable triggers, spring kits, guide rods, firing pin, etc.) and all I can say is that they make great stuff and I wouldn't hesitate to buy any of their parts. If you have specific questions about what parts you need to accomplish what you want to accomplish just call them.
In terms of the Shadow 2, I have an SP-01 that has most of the Cajun parts available in it and the Shadow 2 still easily beats it for accuracy right out of the box. It's a better gun than I am a shooter, but my groups are immediately tighter with the Shadow 2. My SP-01 is awesome and certainly plenty of gun for any application, but if you want that next bump up in accuracy the shadow definitely delivers it.
In terms of the Shadow 2, I have an SP-01 that has most of the Cajun parts available in it and the Shadow 2 still easily beats it for accuracy right out of the box. It's a better gun than I am a shooter, but my groups are immediately tighter with the Shadow 2. My SP-01 is awesome and certainly plenty of gun for any application, but if you want that next bump up in accuracy the shadow definitely delivers it.