I bought this product after I have used the CEF serum last winter. Unlike CEF, the texture of this product is a lot more watery - lower VC concentration and replaced VE with phloretin. So, texture-wise, it is better suited to my combination/oily skin during this time of the year. (I still love CEF, but I won't use it during Spring or Summer.)
Like CEF, it also does a great job energising and brightening my skin during day. The only issue I have with this product is that it oxidises fairly quick, it would be great if they can spilt them into two smaller packings, so the VC stay active a little bit longer.