The free tier is non-commercial only, and makes anything you design available publicly, so it might not be suitable for some users. It's also pricey, the first paid tier is $1500/year (compared with Fusion which is $680/year).

Seconded, OnShape is my favorite CAD package. I passed it over for a long time because I had poor expectations of a browser-based CAD. Just wish I could justify the commercial license.