The Stay In Line Lip Liner in Dolled up color by Jason Wu Beauty is highly praised by Gwan in their video review. Gwan mentions that the lip liner is creamy and has no smell. They also note that they usually apply more lip liner than lip balm, but this product does not have a strong scent. Gwan showcases the end result, which they describe as a beautiful matte look. Overall, Gwan seems impressed with the product, emphasizing its beautiful finish. However, no potential drawbacks are mentioned in the transcription.