I have bought the collector's editiona few weeks before launch for my wife so we could play split screen co-op like we did with DoS 1 and 2.
I understand that in the beginning there were a few issues, but it has been a year and we tried again and again after every patch, tried every online solution and cannot get past the end of act one due to constant freezes and crashes.
To get even there we had to do all sorts of workarounds and janky stuff. The game works fine single player - my wife has completed it lots of times, but I have not been able to enjoy the game with her. It really saddens me, because you can see Larian puts a lot of effort in this game, but come on... One year and you cannot fix something as fondumental as split screen co-op? It is advertised as such, I expect it would work by now.
If any developers are reading this please put some focus on this issue. Your previous games hold a very special place in my heart especially because I could enjoy them together with my partner playing split-screen.