digital signing solution for documents for approval

Hi,

I am looking for a product to digitally sign documents.

- documents would be in PDF format and then sent to user to approve, they would sign the document to indicate they approve it and then would email it to the next party that needs to review the same document and they would sign it or "sign off" on it and the document would be complete.

- ideally the document could be shared to the user for them to review and sign so that the owner knows it has been approved before sharing it to another dept/user for further approval or completion.

What kind of product would you recommend for this type of workflow?  PDFs are currently used but there is not digital signature in place yet.

Has anyone used "DocuSign Business Pro Edition" ?

Thanks,