Used FT Ruff and Spiral Flex as crosses with Big Ace at 61/63lbs in a TT Warrior OS w/ 8g lead at 6 & 9. Racquet weighs 11.6oz and is around 6-7pts headlight (grip built up from 1/2 to 5/8 ). FT Ruff: Crisp, nice pop, stiffer than OG Sheep Micro and Spiral Flex. Liked the control I got from this string. Hopefully the tension maintenance lives up to the claims. Spiral Flex: Springy, bouncy feel. Feels a bit more stretchy than FT Ruff and OGSM, felt more pop than FT Ruff and OGSM. Would like to try this at 3-4lbs higher tension After hitting with these, I don't have a strong preference between the two, but if I had to choose, I'd go with FT Ruff since it felt more controllable. Durability seems better than OGSM for both strings. I need a string that doesn't thin out as much after only a couple hitting sessions like OGSM does.