OK, before I swatched this one I removed I Don't Give A Rotterdam from one nail so I could do a side-by-side comparison. (Sorry — I didn't think to photograph it!) Herring is a bit darker and has a slight teal/green tint to it, so I didn't think I would like it quite as much; certainly not enough to keep both in my collection. However, once I did a full manicure, I found that I liked it equally as well as Rotterdam, surprisingly. (Maybe there's hope that I will eventually find a green that I like, too.) It has that same sparkle but because it's a shade darker it doesn't seem to have that same etherial quality that Rotterdam has. It's still a fabulous color, though.
As with the others in this collection, it does a decent job of covering with two coats but benefits from a third coat to add dimension, and one or two topcoats really boost the sparkle.