I found it pretty intuitive and easy to get started. I use e-sign's service for tenancy agreements for my rental property. I like their pay-as-you-go model which suits my requirement as only I don't need a lot of agreements executed, however I am considering recommending this service for initially for the execution of Non Disclosure Agreements in my company.

The speed with which you can upload and sign a document

That it's easy to use. Straight forward. And many options in term of pricing.