I would never buy Butter London polishes for full price because I don't think that they are any better than OPI.
I bought a few of these nail polishes when Ulta had a buy one get one free sale for $7 each.
They go for $14 normally and are exempt from any coupons that Ulta has.
Overall, the quality is great and thin, but has a full coverage.
I would definitely purchase more, just not for full price!