i would love to see this spine. i have the heritage 150's and still a bit stiff with 125-150 grains up front. i had to go with 250 gr tips to get good flight. with the shafts very heavy at 10.0gr per inch, this was just to heavy overall for longer range shooting, which i like to do. it make those 25 yard and under shots seem easy. a 90 spine heritage will be in my quiver! i am shooting super light gold tip 35-55 with 250 gr tips and i love the high FOC for penatration but there just not as durable as heritage shafts.