Been using this combination for five months. The initial setup is fairly easy, but the real challenges arise after that. One key lesson I learned was to clarify data ownership from the start; otherwise, Clay would overwrite the fields that our sales team was manually updating, creating a significant mess. We resolved this by allowing Clay to manage the enrichment data while HubSpot retained control over relationship information. As a result, our pipeline efficiency improved by 30%, as representatives no longer wasted time researching prospects. One thing to monitor is your HubSpot contact limits; Clay can consume them quickly if proper filtering isn’t applied. We started seeing a noticeable ROI around the third month when our outreach engagement rates surged.