What made me really embarrassed by cons is that all sides are the same puzzle. This means that you have 4 times the same room, with the same pattern and the same shape. As soon as we found two pieces that fit together, simply repeat the feat for each remaining faces. So when I read 216 pieces on the box, it makes me smile. In fact, it is a puzzle 4x54 pieces. And that's why it's also easy to fit (a little over an hour to understand how it works and mount).
Then, the base and the bases for floors leave me doubtful. My turn is perfect, yet my top floor does not hold. There is a lack of work relative to the interlocking parts in the intended plastic structure used as a support.
Apart from that, the parts are fairly easy to assemble, it can be folded and it holds some good.
