I have quilted several client quilts with the bamboo blend batt from Joann Fabrics, and I didnt care for it. The weight was flimsy and it had an odd feel. I dont know what content is in their blend.
The bamboo blend from Quilters Dream Batting is called Dream Orient. It's lovely. I has a beautiful drape, very smooth, really feels like fabric. It is a blend of cotton, silk, and bamboo, and a tiny bit of tencel.
It is much more drapeable than W & N. If your project is a bed quilt or sofa throw, I would definitely recommend the Dream Orient.