We're always happy to hear from us customers and very active on Twitter and on our email support line. If you've got a question or experiencing an issue please reach out.
Added to the above you can contact us via the app (in Settings > About & Contact) or the live chat that appears bottom right of your browser.
We're working on a comprehensive documentation site that will be available shortly that'll help you get the most out of ETA on both iPhone and Apple Watch.