When I got this home and swatched it on my hand, I thought it looked remarkably similar to the Rouge Bunny Rouge Lola eye kohl I already own.
Top Rouge Bunny Rouge Lola, Bottom Le Metier De Beaute Tamarack
Top swatch is Tamarack, bottom is RBR Lola. Surprisingly, Lola swatches darker than Tamarack, although there isn't much in it, and Lola has a slightly more obvious shimmer. They have very similar textures too - easy to smudge, great base for eyeshadows but not my first choice for a crisp line.
So, if you have one of these you don't need the other. If you're buying online anyway, I'd recommend the Rouge Bunny Rouge - it's £17 for 1.6g compared to £20 for 1.25g for the Le Metier. If you can't get hold of the Rouge Bunny Rouge, the Le Metier is a good substitute.