I think comparisons to osage to it an injustice, more like hackberry. That said, if you use enough wood it's excellent in my experience. But you have to leverage it's low density, so I like a relaitively deep core but long design. For a kids bow it should be excellent.
The other problem I had with it was it did not seem to take heat bending too well. I had a couple projects where it was the dickens to get the string to center. On the other hand, I had some billets with 3" of reflex, and I never did get it out during the tillering... ;-)
One I made crushed the belly, but it was hick backed and deep cored and I just didn't get the ratio right. Another blew at a knot, but I'd heated that son-ofa-gun there prolly 10 times and musta had the mc way low.
As with any wood, the specimen, that tree, makes a big difference too. Kinda like osage, the density can vary a lot.
I really liked it, but it's tricky in terms of fit and finish, seemed to washboard at the ring transitions really bad.