1. It's free.
2. The free version has fewer functions, reduced file size limits, and cannot start new (blank) drawings. To get more functions, you pay Autodesk $50 or $100 a year.
3. It is meant to view and markup DWG drawing files on the go, but could also be used as a simple 2D drafting system.
4. It operates only in Microsoft 8's metro (aka modern) mode, so cannot work in Windows 7 or earlier.
5. As a Windows 8 app, AutoCAD 360 must be downloaded from the Microsoft store at http://apps.microsoft.com/windows/en-ca/app/autocad-360/095a823e-3111-4507-bde9-6ac7feeb2a1e. To download from Microsoft store, a Microsoft account is required. To run the program, an Autodesk account is required.
6. It opens files from Dropbox and Autodesk's online storage, but not from the local computer.
7. It displays drawings in 2D model view, 2D layouts, 3D wireframe, and 3D solid (shaded). It must reload the drawing each time you switch between 2D and 3D modes. Its lists layer names, blocks, layout names, and properties in a side panel.
8. It is inaccurate at displaying some AutoCAD objects (traces, solids, 3D polymeshes, vertical text, and so on), and does not display others (constraints, fills, generated drawings, and so on). Dynamic blocks do not work.
9. It can draw simple entities (like line, circle, arc, polyline, and rectangle) in several colors, add redline markups, make measurements, and perform simple 2D editing (move, copy, rotate, resize, and delete); 3D models cannot, however, be edited.
10. When exiting a drawing, all changes are saved; there is no canceling of changes. To exit a drawing, click the Windows 8 pancake button, choose App Commands, and then click the back arrow.