We use this service to ensure our website is compliant with PCI-DSS requirements, as well ensuring that all of it's payment systems are secure (credit cards).
The customer support team has been very responsive in helping us understand what we need for certification purposes - they have also helped out when there was an issue or concern regarding their product itself! I would recommend using them if you're looking into getting your site certified by one third party organization like PCIDSS/HIPAA etc., because once its done everything will be easy from then onwards :).