Alannah, a reviewer on Flip, recently tried the Serious-C3 C Extreme Results by Serious Skincare. She found that while the product was effective in cleansing her pores, it did leave her cheeks a little red and caused a burning sensation. Alannah suggests that individuals with sensitive skin should consider this before purchasing. However, she also mentions that the product contains great ingredients and could be beneficial depending on one's skin type. Overall, Alannah encourages others to give it a try and share their thoughts.