The game is good and works. Sadly whoever makes the script extender for gog version really screwed up and the SE requires the steam api to work. Makes 0 sense but modder was probably lazy. anyway, outside of that, the game is similar version except for the creation store or whatever. You dont miss much, and save space. BGS however declines to fix major bugs as proved by the recent update
What can i say? its a great game. You get all DLCs, fairly bug free (although mod fixes worth it), and not another generic turn based tabletop clone. You get an extremely well written plot unlike all currently modern RPGs (yes BG'3' included if you ACTUALLY played it) and companions are well written from start to finish. While Awakening is not as good as you get new companions, it is a great continuation as well. Have you ever wondered how overpowered Rogue would be in a full plate set of armour while wielding 2 swords? Well, go no further. There are no class limitations outside of some fighting styles and very rarely on gear (very rare actually). Worth even the full price if you ask me, although supporting current bioware as well as EA makes it dubious although supporting GOG is worth it. on a sidenote, i recommend getting the DA2 armour packs, especially for the wardens. looks very good :D