I just attempted to create a CTA using Rules Horizon with a link to the SFDC Opportunity object, something we frequently do in Bionic Rules. I was unable to select the Opportunity ID as an Attribute, the page just said No Data Available. Then, when I ran the rule manually, I received and email it was successful, but no CTA was generated and the Execution History showed a Failure symbol with a red triangle. It was impossible to find an actual failure or error message. I hope these bugs will be fixed prior to GA. Let me know if I should create a ticket for Support, I am never sure when a feature is still in Beta. Thanks!