This is my favorite toy because of - Batman! Automobile! LEGO!
I personally like cars and LEGO is my childhood toy that even now at my current age (almost 30 y/o), I still collect LEGO! Not to forget my favorite DC superhero - Batman! And yea, this is perhaps the 2nd biggest LEGO set I have and this took me around nice 7 days to assemble. Enjoyed assembling every parts and pieces of it!
I have a similar one, superb. I collect boxed lego and only open some when hassled into it by my daughter. collecting star wars at the moment.