I read up until "cloud" and then lost interest in using it. I read up more on it, though, and became intrigued.
I think it's interesting, but it's quite limited:
1. You can only store up to 5 private files with a free license. Which is more than I need for most simple assemblies.
2. There is no browser-based rendering technology that I'm aware of that will make this usable (rendering speed-wise) for truly complex parts.
3. Looks like you have to use raytrace / external rendering tools if you want to present a design.
4. Any application that runs through the browser is sacrificing a LOT of performance, and in proper CAD design, every little bit of processing power is beneficial.
5. No CAM capability.
6. No analysis and simulation capability.
7. You can only export part designs to STL format.... this is a biggie. It doesn't keep material or appearance values and translates the model into triangulated elements, so it doesn't retain the procedural / parametric design structure. You can export part studios to Parasolid format (or even SolidWorks, but this is buggy), but it doesn't export the modeling data / history, just the actual solid geometry, so editing a part after export is not easy.
8. Online requirement.
I do like that it's based on SolidWorks as that is the most intuitive 3D design program I've ever used. I'm interested to see how the branch merging works and handles conflicts.
I may give it a try, but point 8 (in combination with 7) may be a deal breaker for me. I can't always have access to a high speed net connection when designing and if I can't export my parts in an editable format they're essentially locked into their system and on their servers only.
And point 7 combined with 3 means you can't just export and render, you need to assign materials, properties, appearances, etc. Sigh... and I can't do FEA, which I want to get into at a later point... it's just too limited for me, but I see the appeal for more casual designers, making a few keyboard parts here and there, etc.
