I bought both Summer Fun 1 and Summer Fun 2.

Both are adorable, and feature very nice gold accents. These stickers are different from most Rilakkuma stickers in that they feature a washi-tape texture. It works very well, and gives them a matte texture. The gold stands out even more because of this.

There are not many differences between SF 1 and SF 2, but I do notice that SF 1 is more about the beach and SF 2 is more about summer festivals.

They're both gorgeous, and I would buy them again.