"We love Lego in our house, my son has built well over 30 sets (with my help) and I have been building Lego myself all my life. This set was received as a gift and I don't believe I've ever been so disappointed with a Lego set.
First of all, none of them actually stand upright without spending way too much time balancing them just right. Firefly does not stand at all, Poison Ivy barely does and the Batman mech has to be positioned in exactly the right way, but it isn't sturdy and falls over often.
Which leads to my next complaint, pieces of the Batman mech are falling off constantly. Pieces fall off if it falls over, pieces fall off when you pick it up, pieces fall off if it is gently bumped into ANYTHING. We've had this built for 3 days and I've had to nearly rebuild it at least 5 times, not to mention the countless times I've put various pieces back on. It isn't well designed. This set is marketed to children 7 years of age and up, but they can't play with it once it's built without it essentially falling apart. The Batman mech fell from less than a foot off the ground and was in so many pieces I had to bring the book back out to put it back together. This set seems like it was made to be put up on a shelf to look at, definitely not for playing and therefore, not for children."