I've been using Onshape for the last month or so. Just thought I'd correct a couple of things:
Onshape have changed what you can do for free (which is a huge pity). You get the 5GB of total storage, but to do so you have to create the document while you're under the 100Mb Private document limit, and you can have a total of 10 Private documents – I think you can have as many public documents as you like.
Elsewhere it was mentioned that you couldn't print from OS, but it is certainly possible in the version currently in use.
The drawing facility has arrived so that true 2D drawings can be produced from the 3D parts and assemblies.
The thing I like about this is the ability to animate the model, not automatically, but I'm happy dragging the little handles around to watch my Hot Air Engine do its thing – I've even been able to actually explain how it works to my better half!!
Hope this helps.