Its modulus of elasticity to specific gravity ratio is higher than osage's meaning it's stiffer per mass and will pull more weight with less wood but it frets easily, its belly is overpowered by by the strength of the back when chased to a clean ring. Keeping locust wider will make frets easier to avoid but I've made several 1" wide bows that still shoot great, the trick is in tillering it perfectly (it'll let you know if you fall short).
I like osage, it's easier to make into better designs, but I'd give up all the yellow wood in the world if I had to to keep my locust