Having access to older games, great prices, also have access to newer games. The thing I like the most is the library being able to attach my other game sites, to this one location so I can see what I have. I have Epic, Humble and Steam and it’s hard going between them to see what games I have and don’t have when games go on sale. I just go to GOG where they are all pulled together in alpha order so I can quickly. Without GOG I had ended up purchasing games I already had.