OnShape is a joke in its current stage. Sure it has potential, but if Dassault turned around and offered SolidWorks on a CAD model with pay by monthly option then it would make any offering OnShape have to be irrelevant.
I tried to do a simple loft on OnShape in front of John himself and the programmers at Develop3D and it… broke. There was no way it could do a simple loft between three simple sketches and even the programmers could not explain why it was. If I was a paying customer and needed to do that in that moment I would not be able to complete my work. I have never had any of the above mentioned issues with SolidWorks, not to say it is perfect. We are all hoping for the democratisation of CAD and £200/month for SW professional is a good price for users and would likely produce even more money for Dassault.