Like the title says, are the Diamine Shimmer inks more like Robert Oster Shake N Shimmy or De Atramentis Pearlescents? In my experience anyway, the RO and De Atramentis inks perform completely differently with the RO inks only showing the shimmer if the light hits a thick spot in the ink right where the De Atramentis Pearlescent that I have always shows the shimmer. But the RO ink flows quite well in a couple pens I've tried it in where the De Atramentis gives me flow issues in every pen and nib size up to Lamy B's.

So if anyone has any experience with the Diamine Shimmer inks compared to either of the others I'd really appreciate any comparison or feedback. Thanks!