The Donaldson is not the same as the NanoFiber filters.
The AFE is nice, good quality and fast shipping from warehouse. The ends are poly, they are more flexible/softer and likely make a better seal and will last longer than rubber. I like that it does not have the external metal framing or the mesh frame of cotton filters. And dry element is great, vacuum clean or use synthetic element cleaning spray and let it dry out, like with the cotton filters, but no oiling. I am not using it, actually sent it to out in a K47 box to SuburbanK2500, because he still had the flat panel air box with his intercooler setup, and no source. With the ATT, new high capacity intercooler and high performance tuning, the filter will definately get a work out in his sub.
AEM can be had for quite a bit less, and was made with K&N which usually turns me off, as I am not a K&N fan. Although the AEM is a synthetic and not a typical cotton K&N type filter. It has rubber ends and by all accounts they seem to be decent dryflow filters.