I've had the Das Daala foam cored longbow limbs made by sky archery for 3 rivers. I would rate them as average, actually liked their wood core limbs better. I found mine to be noisy and try what I could couldn't seem to quite them down. They had noticeably more mass (beefier) than TT carbon masters and dryad epic LB limbs. Speed was as advertised 4-5 fps faster than the wood cored limbs, but not quite equal to the tt carbon masters (which are my favorites). Smoothness again average. I really wanted to like them better... ended up selling them.