I built some arrows up for my son and put these heads on. I had set some up for customers and was really impressed with how well they spun up and their sharpness. I shot his a bit while I tuned his bow and they flew awesome all the way out to forty. I wouldn't hesitate to recommend them to any of our customers.
That Viper Trick is tough as nails & the sharpest head I've see come out of the package. I took an elk with the 125grn head & you could still shave arm hair with it & the head & blades buried into bone. I touched the head up on a KME & my son took his elk with it as well. It too shattered a rib bone head on & the head is still shaving sharp & the chisel point is in perfect condition after both elk, it's ready for a 3rd one now! This is a great head! They will tip my arrows next year again, I shot them to 80yds with no issues.