I got this nail polish probably over a year ago and I thought it would be the type of product I would very excitedly recommend to you but it's not. I love the concept- a brown/taupe with blue/green duo chrome. Sounds like the nail polish version of MAC Club Eyeshadow. Plus, this formula has a cool flat rubber/matte finish. Sadly, it didn't live up to my expectations.
This formula ended up being rough on my nails. It left them a bit "dry" (and I applied a base coat under it like I usually do). Plus it stained my nails a lot. They were yellow for over two months after wore this. My friend had a similar experience with a different color from this range. (By range I mean the Sephora Formula X Brushed Metallics, not the entire Formula X line.) Staining is something that is mentioned a lot on the Sephora customer reviews. Not to mention that the Brushed Metallics variety has a low rating on the website. They're also on sale right now ($6 each, down from $12.50) probably because word has spread about their quality (or lack thereof).
Sadly, I'm going to have to recommend you skip the Formula X Brushed Metallics altogether. They don't last long on the nails and they stain like crazy. Let me know if there's any disappointing products you've tried recently.