After recently buying some of Bob Morrison's foam core limbs and shooting them, I don't think the foam can be beat. That said, there are many great bows out there with wood core limbs that are outstanding. I subscribe to the idea expressed above that a great bowyer knows best what will work in his bow design and he should be given the liberty of suggesting the material he thinks is best. Who is going to criticize Bill Howland, Ron LaClaire, Norm Johnson or one of the other greats because they don't use foam cores like Bob Morrison? Not me.