Skill level 6 (max): +24% attack speed, +32% defensive ability
Skill level 10 (ultimate): +33% AS, +50% DA.
50% DA is just too much. It almost breaks the game for hunters. I know it's difficult to get +4 skills, but for 6 skill points the returns are just too much. Increasing the max level to 10 wouldn't solve the issue IMO.
lvl 6: +24% AS, +25% DA
lvl10 : +33% AS, +35% DA