As it says on their landing page; "It's safe. It's fast. It's free." It is also almost embarassingly simple to use.
There are some usage limitations. The free version includes:
Military-grade encryption
7 Day limited message retention
100MB message storage
10MB max message size
20 recipients per day
If one's specific needs are greater, the paid version is well worth it:
Military-grade encryption
Unlimited message retention
10GB message storage
200MB max message size
200 recipients per day
Custom message expiration
Message retraction
Message auditing
For my own modest requirements, it works great at the free level. Review collected by and hosted on G2.com.
I really can't think of any downside, unless one's requirements far exceed any of those limitations. Review collected by and hosted on G2.com.
