Amicus,
I have no experience with Bob Lee but I do know that years ago I had two different bows with carbon from two different bowyers and both made a ping sound that I could not get rid of. Other's told me the same thing. Those were the early carbons pre 2010.
About 4 years ago I acquired a carbon limb bow once again and NO ping, and very quiet. Then about 2 years ago I acquired another and same thing.
I think they would be very beneficial for lighter weight bows because they do create more energy.
Again, I have no experience with Bob Lee.