I have/had several sets of morrison limbs cheyenne recurves,ILFs,Cheyenne longbow limbs,cheyenne Bamboo limbs. I have shot them all through my Chrony with the same a 540gr arrow my findings have been just what Bob said in order of speed bamboo the slowest,then foam, and then carbon/foam being the fastest. That said the bamboo limbs I had were world class limbs fast,quiet, and smooth draw so its really hard to pick a set of limbs from those three choices. As far as failures I haven't had any but if it worries you just go with the foam they will be great limbs when you get them.