I have used the Copper Johns on my bows. I like the Pro II the best. It has a dove tail mount & can be leveled to the bow. The Pro is a direct mount, and is more compact and lighter. It can be leveled as well. The .029 pins are much brighter than the .019 pins. Make sure to get a 2003 model sight. The area where the pin guard adjusts for windage has been beefed up to allow more clamping force to keep the guard from moving. I had a Pro III that moved. My Pros have not, and my Pro II is an 03 model (does not move). Sighting them in is not hard to accomplish. Copper John offers a light foe these. PSE also sells a light that fits. These are the ones I use. They definitely help indoors.