Considering the cost of this unit it is quite deficient in quality:
1.  The whole unit is too flimsy. The mechanisms used to secure each major piece together become loose too easily.
2. The door hinges also become loose too easily. Aligning the doors for square fit is too hard.
3. The back piece is too flimsy also.
4. A piece this large and costly should have an assembly approach that ends up with a much more sturdy and secure cabinet.