Are they really under-appreciated and under-valued? I recently found a very interesting article concerning back-side value multipliers in T206 resource (by Scot Reader). I'd highly recommend taking a look -- here's the link.
http://t206resource.com/Article-T206...ltipliers.html
My take away was that the value multiplier for CB was just about the same as Brown Hindu and consistent with the relative difficulty of the backs. I think I'd ask the same question as the original poster about AB350nF, though