I used bamboo once, recently- the one from Joann's- and I LOVED it. However, I have heard someone on the board had a problem with it making spots on their quilt.
My SIL, who has the quilt with the bamboo in it, has not had a problem yet.
The drape and the softness of it- just unsurpassed to me. I hand quilted that quilt and it was so easy to quilt through. There were no thick/thin spots, and all the folds and wrinkles that you normally see in bagged batting just sort of fell away when I opened it.
I have used poly and did not like it at all, so mostly what I use is Warm and White. (I use a lot of white in my quilts.) It is fairly inexpensive and it is readily available to me.
(Oh, and I did use a half-off coupon when I bought the bamboo, because it is pricey.)