I've ordered and tried 11 different types of I'm Real sheet masks.
The good thing is that I didn't get irritations from any of them, and the bad thing is that I didn't especially like any of them. However, I think that some of them are a bit more moisturizing and they give you a bit longer feeling of fresh and plump skin. So, if I had to use some of those masks again, I would use: Avocado, Pomegranate and Makgeolli.

All masks have very similar list of ingredients and I don't believe any of them is really effective in pore care, brightening, skin purifying, etc.
I think you can buy and try better masks for this price, but I have to admit that the packages are really pretty and photogenic.