We have been using Sintel Forms for a while and we really enjoy them! They're great.
The only concern we have is that a lot of the feedback we receive on the forms is that the 'Save' button is confusing... Confusing in the sense that it is in the top left (difficult to see) and the wording 'Save' is weird terminology. (Many people expect the word 'Submit')
We were hoping that there could be a different option for submitting a form within Sintel.