I tried the OneShape beta and was impressed. I do mechanical design for a living and use mostly NX and SpaceClaim at work. I have also briefly used CATIA, Solidworks, and Pro Engineer in my line of work. But at home I'm a Fusion 360 user because:
* Free. Not free to try, but free free. The only hook is you buy a license if your start-up makes more than $100k/year, and even then the license is a cool $300/year.
* Convenience of the cloud but works offline if needed.
* Runs natively on Mac.
* Integrated CAM (but I haven't tried it)
* Leverages cloud for rendering. So you can make pretty renderings much
without tying up your computer. (This is another hook, you get excellent free cloud rendering but need to pay for even better cloud renderings. You can also render for free on your machine like any other CAD software; if you can stand the wait).
* Basic structural analysis in your machine or in the cloud will be deployed any day now. (Again, you will get much quicker results and don't tie up your computer with analysis. And again another hook for paying to use more than your regular allotment of cloud CPU cycles).
* 1-Button send to Simplify3D
* You can do both parametric and direct modeling on it. Most parametric modeling software have direct modeling capability as an afterthought. Here it is integrated seamlessly.
* Integrated quotes for milling or injection molding your model (but I haven't tried it)
* AND HERE IS THE BIGGIE FOR ME (aside from it being free, and having a native Mac version, and upcoming analysis): As far as I am aware, it is the ONLY
Mechanical CAD program that has surfacing technology found in artsy programs like Blender and Maya. So you can actually design consumer goods with flowy shapes on it. This is practically impossible to do in other Mechanical CAD programs. Here's something I'm working on for example: http://a360.co/1X8hqIj
By the way, see how convenient working in the cloud is? You didn't even need to download a viewer to see my model. And if I added you to my project, you could have annotated my model, from your smartphone! (You do need to download their free app for this).
If you have experience in the CAD industry and these features on a free program seem nuts to you, it's because it kind of is. But that is the crazy world we are living in, we might as well embrace it. I think the best way to put it is this:
I can honestly say I would pick Fusion 360 over the $30k software I have access to at work. Fusion just happens to be free, and that's a good thing because I would not have discovered it otherwise.