specifically within the Vertex color array, I have found that all my export options (whether it be maya, blender etc) dont ever seem to export to the latest .nif version. As I find the obj export/import method works fine for me this is not a problem until I try to get back my Vertex color info.
A way around this would be the ability to open an old .nif export (with color values intact) then copy those to the newly imported obj mesh (later version .nif file)
the ability to copy/paste these colour values between properties would effectively kill the need to require a new .nif exporter as I could just copy values to the new file from within nifskope. I find chaning the values on each vert rather tiresom and extremely unproductive.
DeadlyAzuril / Benjamin Swinbanks