From the Katy Perry collection by OPI - Not like the Movies is my favorite duochrome!
This is a light, almost smoky gray which changes into a subtle pink or a light green at different angles.
There are small shimmer particles in the polish, which help give it a bit of a metallic look.
OPI NTLM is comparable to Wet 'n Wild - Gray's Anatomy in its colour-changing effect (gray to pink to green) but NTLM is more shimmery, where GA is pearly finish.
Polish application is smooth, since OPI has the wide brush, it took about 3 coats to get a full duochrome effect. I also really like this polish since it never feels thick and always goes on perfectly, dries fast.
In conclusion, this is one of the more subtle duochromes out there, but if you really love gray polish with a little "flair" like I do, you'll find this one indispensable.