The Slim Waterproof Fixxy Liner - Black in Black color by Peach C is a slim waterproof liquid liner that was reviewed by Angeles. In the video review, Angeles repeatedly mentions the key features of the product, emphasizing its slimness and waterproof formula. The liner is described as being easy to use and long-lasting. While the video review does not provide any specific drawbacks, it is important to note that the transcription does not mention any additional benefits or unique features of the product. Overall, based on the information provided, the Slim Waterproof Fixxy Liner - Black in Black color by Peach C appears to be a reliable and effective option for those in need of a slim and waterproof liquid liner.