I love this puzzle, but it's quirks have really brought it's rating down. The puzzle has had its inner thin edge pieces fall out multiple times, and then the whole puzzle falls apart. I love its shape shifting, but the design of the puzzle makes it catch very often. I tried lubing it with cosmos lube (good lube by the way!!) and it made it fall apart more and turn worse. Although i take the blame for lubing it, it feels like the puzzle sacrificed stability for shapeshifting. A version that is very stable (like the 1x2x3) that doesn't need to shapeshift would probably be a better choice for me. Overall, the puzzle's concept is nice. Easy for beginners; all the way through. But I am a bit disappointed in this puzzle's design and hope it is upgraded in the future.