Based on the user reviews on the Apple App Store, here are three cons and pros of the "Disassemble It 3D" app, each limited to 15 words: **Cons:** 1. Some users found the app's 3D rendering and rendering speed to be slow and laggy. 2. Others noted that the app often crashes or freezes during complex disassembly processes. 3. A few users reported difficulties with the app's user interface, finding it confusing and hard to navigate. **Pros:** 1. Users praised the app's ability to accurately disassemble complex assemblies and machines, even for beginners. 2. Many reviewers appreciated the app's educational value, saying it helped them learn about engineering and mechanics. 3. Some users enjoyed the app's interactive features, such as the ability to rotate and manipulate 3D objects.