Sebum Gold serum. This was my first use of the Sebum products. The serum felt greasy on my hands but seemed to be absorbed into my facial skin pretty well, and it further softened the skin beyond the effect of the soap. Since I rarely get any skin irritation, which is handled well by splash aftershaves, I'm not at all sure the serum is a necessity. I don't really like the musky fragrance very much, but that may change with time. Overall I was generally pleased with the results of the shave but not tremendously impressed, and I'm left thinking that for me the software is quite overpriced (the serum even more so than the soap). But this was just a single use, and no doubt my views will be moderated with further experience over time. I'll comment more then.