Just a question for everyone while on the topic - Why to use Docusign vs Hellosign vs RightSignature?

I found and very much like DigiSigner.com which is $15/mo/seat or $120/year/seat and the 5th seat is free. Unlimited sends and signatures.... I can even create my own PDFs with LibreOffice and upload them and it keeps the fields. Unlimited templates for emails to send, and some other nice features.

I just haven't tried anything else, but it's been really nice for me. Why are the advantages of Docusign?