happy1,
I'll comment although you have to consider me a biased source since it's my and Larry's company. I'm the testing and R&D geek and seldom offer a subjective opinion since they're so, well, subjective. But in this case I'll do both. The objective part is easy. These limbs increase performance.
By a material margin the fastest bow test I've ever conducted was on our 64" limbs made with this bamboo. I'm anxious to test more sets to build a collective data base that covers the bow-to-bow variations that any bow design can have, but I'm confident that the performance increase is very real.
With that caveat out of the way I will say that normal bow-to-bow variations caused by slight differences in materials will not overcome the speed increase I measured in that one set of tested limbs. I feel comfortable in saying that objectively you will experience an increase in performance.
The subjective part is also very good in my opinion, but you know what "they" say about opinions. These limbs "feel" very, very good. For the ultimate subjective wham-o, when made up as one of our ACS-ACX limbs (with all carbon wedge to complement our 4 layers of carbon on the limb surfaces) the subjective feel of these limbs is superb.
Now that I, your friendly biased source has commented, maybe you will hear from some of our satisfied customers who now have these new limbs.