I will fully admit that I was drawn to the Revlon Colorstay nail polish in French Roast because it reminded me of a non-matte version of ManGlaze's Santorum (here is a link to PinkSith's fantastic review of that polish).
French Roast is a dark brown with a good bit of red and blue glitter. While the glitter shows up nicely in flash photographs, I have to say on the nails it is nearly invisible. The end result is that on the nails, French Roast tends to look like a generic dark brown polish.
French Roast was a bit of a pain to apply. I found it to be far thicker and more uneven than any of the other Revlon Colorstay polishes I've reviewed. I definitely needed two coats to get it even and three to get the best results.
This polish didn't wear particularly well either. I had significant wear on the tips and even a bit of chipping after two days. I do realize that the darker the polish, the less forgiving wear can be - you can't hide anything.
Again, the glitter is visible under bright lights or with a flash, but to the naked eye - not so much.
Overall, I am unimpressed with this polish. The quality is very lacking when compared to the rest of the Revlon Colorstay line.