Docusign has established themselves as a leader in Electronic Signature.
Long before it became a norm - and entered into Real Estate field.
NAR does provide some additional discounts should you decide to make this as your service provider for electronic signatures.
Great product - and is there for a long time.
It is also likely to stay for long time.
So if you have no other options for electronic signature and want to save time, Docusign is the way to go.