I think this last set is the weakest (impact-wise) of the series.
The craftsmanship is of course outstanding but the choice of masks is probably the weak link here.
The first set had a more universal appeal (impact) whereas this set is rather "bland" in comparison and, unless you have a special interest in the particular mask or culture, they do not "speak out" to most of us (IMHO).
Of course I am sure they will appeal to some and since they are very limited, it is probably just as well.
While I appreciate the effort and audacity behind the concept, I would prefer a "Tribute to the Great Explorers" or a mercator in terms of alternative time displays. Of course that's just me.