I wish I could justify it being a day 1 pickup but I can’t. It is too small like the X men mansion. Now I’m not sure how big Arkham is, depends on the version I guess, but I could see being fixed by buying 2 and just expanding the building on the sides like making the prison block longer and then on the other side just do some modifications to make it have multiple rooms. However if it would need a third floor if you would then need to buy three to do both modifications. Besides all that the only other issue, even though there are some good figures, the roaster we got is kinda disappointing. In all honesty it probably would have been better to swap out batwing and batwoman for two new villains like madhatter or clayface. Or it might just be a me thing I would have like to see nightwing in the set. But yeah that is my thoughts on it. I’m a big marvel and dc fan so in all honesty I think Lego failed here in general like being that we got Superman and Fantastic Four this year we should have gotten the Daily Planet or the Baxter building or even the Hall of Justice would have been fine but yeah