I started shooting lighted nocks several years ago and spent a good season trying to find the brand that I thought worked best for me. I shot the nockturnal and was immediately impressed with the ease of use. I have found that the red and green are easiest for me to track and find after making a shot on an animal. The other colors don't seem to be as bright. When the strobing nock was added it made it that much easier to track and find. I have even started using the nocks on all my practice arrows and when you get out at distance you can immediately tell where your arrow is hitting and track the arrow flight. I have noticed that these aren't water tight and will fill with blood when stuck in an animal. Not that big of deal though as they will still work, just not as bright. When the Universal FIT was introduced it made so much sense. I am not one to shoot the same arrow as I like to try new equipment. It always left me with nocks that I no longer could use. This solved that problem.