I love the texture and consistency of this serum, unlike other vitamin Cs which I've found to be sticky/tacky and unable to spread easily across the skin. While I don't believe that's a problem in terms of product effectiveness (rather it speaks to how it's reacting with your skin), I haven't find the other formulas I've previously used enjoyable to use. It also has a subtle and pleasant smell, again, unlike other formulas I've tried which have had an unpleasant and strong odour. I'm nearing the end of my first bottle and am going to purchase a second one. It's probably too early to tell the results and I have changed other products recently too, however I feel positive about it so far. The skin care expert I see recommended this product, noting it's ingredients are good, again, unlike some other products out there which don't really have the right concentrations of the right ingredients to be effective... so I feel my choice has been well informed.