The first thing I care for these types of apps is that It should be secure as I might use important documents so i should make sure no info might get out of it. as I know they use public key cryptography with AES-256 encryption which make me feel more relaxed about security.
There are other features that I like about it like Importing documents from third-party applications , Signer authentication code that it use and also its templates.
Actually i didnt find negative points in this application.
This is a secure application and so flexible as you can use your own brand and their templates and every thing will be done so fast and without useless extra work.
The main problem is the security of our documents and as they use bank-level security so we have relief in this case. besides the people who sign it can access to it via any operating system or device.
We get rid of printing, scanning, and forwarding documents and by using their template and bu using email the signee anytime can do the sign work.