I've tried FOBs now for several weeks and like the results. They definately stabilize the arrow quicker than any vanes that I have had. While shooting 50 yd shots I kept hitting a tall weed about 7 yards from the target (until I yanked the thing). I watched several arrows kick their back end out when hitting the weed but stabilize and hit where I intended within the final 7 yards. All in all, my point of contact actually did move up just slightly, which I am attributing to a slightly lower weight compared to vanes. All in all, they brought my broadhead contact very close to my point contact location with no site or bow tuning. Two potential downsides. First, you have to use the FOBs with a drop away rest that gets out of the way quickly. They aren't very forgiving if it hits your rest. Second, from my point of view as a shooter they sound loud. However, I had a friend stand just off my target while shooting 30 yd shots and he couldn't tell an audible difference downrange between the FOBs and arizona vanes. Although I said two downsides, one other one is that you can't stack arrows with them. They are expensive and when you stack arrows chances are you will blow a few apart. Bottom line for me...I bought several more and am going to hunt bull elk in one of Arizona's trophy units this fall with them. Hope this info helped. By the way, trying to tear vanes off of carbons is hardly worth the effort. I started from scratch with these things on bare shafts.