Talk to the bowyer and see what he thinks. Some bowyers I have talked to and/or researched love it, some say it doesn't make any noticeable difference in their bows, and some just won't use it. I have limited experience shooting longbows with bamboo limbs, and I will (cautiously) say the few I shot were not remarkable in performance, nor could I tell any difference in them over one with wood limbs. If possible, shoot two of the same bow except one with and one without bamboo, and draw your own conclusions and/or talk to as many bowyers as you can and get their opinions.

Chad