Either Moleskine have improved the quality of their paper, or Robert Oster ink is magical, but it definitely doesn't suffer from feathering/spidering/spread. There's some show through, and in wider nibs, a bit of bleed through, but nothing that makes it unusable. That's pretty surprising for such saturated ink, and good news for those looking for Noodler's ink replacements.
Tested with fine, medium and 1.1 stub nibs with equal success.