It's alright. Only done it a couple times, and there were people on it at launch, but not so much nowadays, sadly. Don't expect it to take up more than a few hours of your time, it's little more than a gimmick IMO.
The space and time could have been put to much better use in the main story, by adding an extra 5-10 hours playtime, more quests and another city. Also, the ability to play as any character, whenever you want.
Alas, it was not to be.







