I bought some on a whim last week, mainly because it has SPF 20 in it and it said i can wear under my make up. (Or without make up)
Without make up it just looks like my normal face so i use my normal make up over the top but after a short while my face feels greasy and clogged and i really am just itching to scrub it all off. Without bb cream my make-up lasts most of the day before looking a bit patchy or shiny. The look i get when i use the bb cream under foundation is great initially, i really like it but it becomes shiny very quickly. Im not really keen to replace with a more expensive one as i was happy with my make up before it anyway but am just interested in what its actually supposed to do.