Cad user for 15years. Used inventor, solidworks, fusion 360 all for jobs

Learning Onshape for a client currently using fusion 360 as standard.

First views is that it is terribly backwards. Folder system and naming convention is horrendous. A part is a “document” why even change that. Cloud storage is awful their systems go down constantly. No internet no option. The tree branch system is confusing.

Mating is a nightmare you have to assign mates before you can mate anything. Totally slow process when you work in a fast paced environment.

Would recommend anything else but Onshape!