It's advertised as co-oppable but is the co-op in this game actually (still) working?
I'm reading on all these multiplayer issues with the gog version, so, although most of them appear to be revolved, did anyone actually play this game in co-op already?

Thanks

I haven't tried it myself but I'm pretty sure it's working. The "issues" you refer to are mainly the fact that multiplayer requires a key, which you need to request from GOG. To do so, go to the Support link at the top of the GOG page, then click on "Contact Us", then on "technical issues with games".

From there you can pick Two Worlds, and select "multiplayer key request" from the list. Send that in, and you should get a key within a few working days. Once you have that, multiplayer should work fine.

Can someone else confirm that they're been able to get into multiplayer games with the key?

I confirm.
I have been sent a key and I managed to log into the servers.
Good luck

Is it any fun? I got this over King's Bounty because I was expecting to be able to play it with my little brother using the same copy, I guess we'll have to wait until he buys for himself.

The co-op is working, though to get it turned on is more of a pain that it should be. You won't get your serial number to access multiplayer until you mail GOG tech support. (And make sure you specifically write in Two Worlds in your message too...the native page for it should include it automatically, but I lost days because they asked me what game I was referring to.)

In addition to unlocking the multiplayer, registering will email you a code to unlock one of five unique items in the single player campaign.

Unfortunately, while the servers seem to have a lot of promise, I'm only getting about 3-5 frames per second when I'm on. My single player maxes out all the graphics, so that's not the issue...the fact that there's tons of US servers, all showing 0 of 50 people, made me actually happier cause I thought it would be faster. But it's all but unplayable for me, I'm not sure if there's anything I can do on my side to improve the frame rate. And that's not a GOG issue, it's Two Worlds that's hosting it (isn't it?)

It's a shame, because the multiplayer is different enough to be exciting. You can make a female, you pick a class and trainers are on hand at the beginning to basically build what you want. New missions (sounds mostly group oriented) will unlock more and more of the world map.

Maybe I missed it, but I see no link for "multiplayer key request" on the page you mentioned.

Sorry, I forgot one step... over on the right side of the page there's a link that says "I can't find a solution for my problem". Click that, and then you will get a form where you can select Two Worlds and Multiplayer Key Request.

It is unfortunate that GOG makes this so tricky to figure out. I wish they had clearer instructions for how to do it.