While I think the paper reports some very interesting observations and that it makes a solid case overall, I'm left wondering about two things:
1) How were these things used as ornaments? They're not pierced, nor do they display no obvious wear traces from having been worn suspended on strings or thongs. With purported feathers, it's one thing. But these things puzzle me a bit from that standpoint, since even the shells found in Aterian and other MSA sites show some kind of wear from having been strung and worn.
2) I would have loved to see better shots of the cut marks. By this, I mean microscopic shots of the internal morphology of some of these marks themselves to show unambiguously that they were made by stone tools? Don't get me wrong, they certainly look like cutmarks, at least superficially, and their standardized placement on multiple specimens strongly supports the authors' claim. But as the controversy over the Dikika cutmarks has shown all too well, multiple factors can result in marks that can look like those produced by stone tools, so why not rule it out with some good photographs in this case?
Be it as it may, these new data build on the growing corpus of evidence for the use of things like feathers, ochre, manganese and shells as ornaments by Neanderthals well before the arrival of modern humans on the scene. All in all, it also suggests that different groups of Neanderthals likely used different types of ornaments and coloring materials depending on the ecological setting and available animal and mineral resources.
(2012) Presumed Symbolic Use of Diurnal Raptors by Neanderthals. PLoS ONE 7(3): e32856. doi:10.1371/journal.pone.0032856