Picked this up in the boxing day vault. Very official and information loaded packaging. The mask itself was folded inside the sachet without additional plastic sheeting which I liked. The gold side was applied facing outside. It was very dense with serum. I left mine in the fridge before application as I wanted a cooling mask.
My skin does look brighter and hydrated. The excess serum I just rubbed in to face/neck/decolletage and my arms as there was more than enough in the packet to do so.
I don't really understand what the 24k gold is for and don't believe it made any additional difference. Seems more like a gimmick/selling point than something that actually provides a purpose.
As a standard sheet mask with the serum I think it's great and serves it's purpose. I rarely get sheet masks in general but this particular one i'm not interested in repurchasing.