It's easy to use, has great customer support when you do need it (so far) in terms of troubleshooting issues for your clients but I have not needed them yet! There are some features available which we had hoped would be there by now such as integration into Google Analytics or Hubspot however they keep promising more options will come soon so maybe this one? Great product overall though - all integrations work well together from CRM/Salesforce through email marketing platforms like Mailchimp down even if those aren't specifically mentioned here.
We've already integrated Salesfron & Marketo data sources along wtih LinkedIn contacts and other social media profiles too - no problems at all!!