Plus, yeah, you get to see if the other party signed, all the appropriate spots for signing are flagged, the entire audit trail of the document.
It's super convenient.
Also, it's cheap AF. A personal account is like $10-15 and a business account is $25-45. That's pocket change for the service you get.
EDIT: I've worked on document management software. Let me tell you that people will pay bank for document management -- without even the signing part. In any field.