I purchased a 6 pack of the Pro Elite Omni-Brite 2.0 arrows (HEA-638.6) and a 6 pack of the standard Pro Elite (HEA-620.3) arrows. Because of the cost difference my plan was to use the standard arrows for target practice and the Omni-Brite arrows for hunting. The standard arrows were great, very consistent. I decided to shoot just one of the lighted arrows to verify that they flew the same as the others. The first time I removed the nock to turn off the light the whole insert came out of the shaft. No big deal, I simply glued it back in but I had big problems with the arrow not grouping with the standard arrows. I was about to call Ten Point and return all 6 of the Omni-Brite arrows when I noticed a wear mark on the down vane. After close inspection of all the arrows it appeared that the nock was not aligned properly with the down vane of the arrow. Given all the indents on the omni-nock I assumed it didn't make any difference how the nock was installed. Believe me, it makes a big difference. At least it does on my Turbo GT. You need to make certain that two of the opposing indents on the Omni-Nock are aligned perpendicular to the down vane of the arrow. I used a tooth pick placed across opposing indents in the nock to insure it was perpendicular to the vane and the arrow now flies perfectly, grouping tightly with the standard arrows. Don't know why they have 5 indents on the nocks when only two are used if aligned properly. My other complaint about the arrows is that both the standard and the Omni-Brite came with glossy white down vanes. The two arrows in the quiver stick out like a sore thumb due to the white vanes. Waving a white Kleenex around your tree stand or blind might do a better job of attracting the attention of deer or other critters but not by much. There are few things in the woods that are pure white. A deer's rear end and my arrows are two of them. I used a permanent felt tip marker to paint them black. Whoever's idea it was to use glossy white vanes needs to spend some time in a tree stand trying to be invisible.