The PAYG option, it works well for small businesses.

We've been using E-Sign for the last few years and as a small web agency having clients sign maintenance & development contracts has been invaluable. The contracts are legally binding and have been used by us as evidence in claims court to retrieve monies owed. We've found the web app to be fast, intuitive and very easy to use, which is vital for causing least friction to potential clients during the key agreement stages.