Has anyone used adobe sign professoinal service for customer email template in adobe sign?

We are looking for some customizations of the adobe sign emial template. 

I am wondering if anyone has used the adobe sign professiona service before for the customization of the email templates in adobe sign?

https://helpx.adobe.com/ca/sign/using/custom-email-templates.html

According to the link above, we have to go through adobe sign professional service to update the email template sent through adobe sign and it comes with additional cost....

Not sure how good their professional serivces are. Could anyone who have dealet with the professional service in adobe sign share the experience? Much appreicated.

Thanks