I like the BBs too. The covers fit Natalie well - we've never had a blow-out.

I find the hemp is a tad scratchy for us (although I did have the earlier hemp version, the hemp is softer now I think).
I think it must be... I don't notice too much of a difference in the feel of the fabric... But I like the bamboo because of the colours Although its a major design flaw having these lovely coloured nappies and boring white covers LOL!