When I first bought the 190 grain treesharks I was skeptical. I thought there's no way these heads will fly well and not plane. I was surprised when I shot them and they flew like darts, hitting right where my field points hit. I have had the same experience with the Great White heads. Here's my theory as to why they fly so well. At the end of the shaft the head is less than an inch wide. All of the width and most of the surface area of the head is behind the tip of the shaft which makes it act more like fletching. Simmons calls this "reduced tip leverage" on their website.
The tape measure is layed across the head at the end of the shaft.
I'm not trying to convince anyone to try these heads, just sharing my thoughts on why they fly so well for me. These are the kinds of things I think about when I've been sitting in my turkey blind for a couple hours waiting to hear that next gobble.
One of the drawbacks is that you do need an arrow that's an inch longer to accommodate this head and if you use a back quiver, they could be difficult to draw out because of the width. On the plus side though, they named them after one of my favorite 80's rock bands, Great White!