The biggest shortcoming I have encountered in the free version is its limit of 3 supported devices for store and sync, and this is heavily mitigated by an excellent web platform. The limit of 2 GB constrains it's usage a bit, as well as the fact that with the Basic free service all files all stored locally on all platforms that have the native Dropbox app installed.
Dropbox Plus mitigates all three issues by allowing you to sync across unlimited devices, free up hard disk space, and increases storage Capacity to 2 TB (2,000 GB) as well as enable 30-day account recovery for $9.99 at the time of this writing 1/15/21
Check out other plans and great features:
https://www.dropbox.com/plans Review collected by and hosted on G2.com.