How do you measure the effectiveness of messaging and positioning? What are your KPIs?

• Conversion rates across the funnel - Did the messaging drive the desired actions at each customer touchpoint from initial engagement to sign up/trial/purchase
• Landing pages, emails, posts, and ad performance - How did individual assets and channels perform relative to benchmarks? 
• Sales asset usage and engagement - Which assets, talking points, and messaging were used, and how did prospects and customers engage? Highspot will show you which sales assets are being used the most and which are driving the most customer engagement, while Gong.io provides sophisticated insights into sales calls to determine what’s working and what’s not.
• Finally don’t forget to capture qualitative feedback on your messaging from customers, prospects, and internal stakeholders. While presumably, you’ve done this pre-launch, another round of feedback post-launch will provide further insights you can quickly apply to post-launch campaigns for a fast follow.

It's pretty difficult to get a straightforward read on the effectiveness of your messaging and positioning but there are a few things you can do to ensure your messaging is more likely to succeed. 1) During the process of creating the messaging, work with your market research team to test aspects of the messaging with prospects and customers. This can be both quantitative test of words or descriptors you use as well as qualitative tests where you actually test aspects of a pitch with customer. 2) Get input early and often from your sales, customer success, and support teams. 3) Use A/B testing to evalute how the messaging resonates on your website, search, social copy.  

Once you've created the messaging, you can use your channel metrics to track how well it's resonating but give it time. Any change of messaging takes a while to take hold with the audience (be it sales or customers) so don't be in a rush to make an update just because you see metrics dip initially.