Amazing heads! I use mach3 daily, shaving my head and part of my face. The classic mach3 head lasts me 2 weeks, but the shaving is not the same after the first 3-4 shaves, because the lubricating strip wears out relatively quickly. I've been using the charcoal head for at least 10 days now, and it feels like the first day! The lubricating strip has not worn out, nor has it come off its place, and the shaving is noticeably deeper than it would be with the classic head after the same amount of days of use, with zero irritations (not that I had any particular problem with the classic head, but I would be more careful after the 10-day mark, here nothing!) It seems to clean better as well, but it may just be the overall positive experience. I will come back if needed, but I think I will only be getting these from now on.