I've used nothing but the Helix since my return to recurves in 2010. I love them! Full disclosure. The inventor and distributor is a good friend. Long before he created the Helix.
I've taken 6 deer and one bear with the Helix.
Over the previous 41 years of bowhunting I had used mostly Bear Razorheads but several others as well.
The Helix is tough, true, holds an edge, and flies terrific. While I don't usually like or trust the carbide sharpening tools, I use the one Strickland makes for the Helix and it does the job. Otherwise I find a single bevel defies my favorite way of sharpening broad heads with a crock stick.
I've used Helix that weigh 100, 125, 200 and am currently using 155 grain on Deep Six FMJ.
All six of the whitetails were shot from 8-21 yards, broadside. Five of them dropped in sight in less than 55 yards. One big doe made a 90 degree turn and ended up (lung shot) about 120 yards or so. The bear (Idaho this year) was shot at 16 yards and traveled about 40. I saw him fall and do two somersaults down the mountain. Thank goodness a tree stopped his tumble.
To get the most out of theses single bevel heads you must match the feather wing (L or R) to the broached. The first year I didn't. Still killed two deer with no problems but I learned later that I should have matched em.