As Google Ads new Responsive Search Ads (Beta) continue to take shape, more data is becoming available to provide insight into performance.
Now below the RSA ads displayed in the Google Ads UI there is a link labeled 'View asset details'.
This link leads to impression data on the assets (headlines and descriptions) as well as the combinations automatically assembled.
(more about Position pinning below)
In case you are not aware you can pin the position (or order) in which you want your headlines and descriptions to appear.
Hopefully, soon we will get additional data such as CTR, Conversions, etc. so truly informed decisions can be made when managing this new ad format.