The reviewer, Kara, expresses her satisfaction with the blendercleanser solid (Charcoal) in Charcoal color by Beauty Blender. She appreciates the practicality of this product, as it effectively cleans her sponge and is compact for easy travel. The charcoal cleanser acts like a soap, providing a thorough cleaning experience. Kara mentions that the only improvement she would suggest is the addition of a handle for better grip. Overall, she considers the blendercleanser solid to be a great product. Its ability to clean sponges efficiently and its portability make it a convenient choice for makeup enthusiasts on the go.