Respona is a great tool. I was debating between giving it 4 or 5 stars, but the excellent customer support convinced me to go with 5. Here are my thoughts:

WHAT I LIKE

* Customer support deserves a special mention. After reaching out through both their regular support channel and a question I posted on AppSumo, I received quick replies. They even upgraded all of our features after realizing there was a mismatch between the AppSumo listing and the actual offering.
* The quality of the leads is excellent and noticeably better than with other outreach tools I've tried on AppSumo.
* The UI is clean and easy to navigate. I also really appreciate the onboarding webinar and videos, which provide a lot of helpful context and best practices.

WHAT CAN BE IMPROVED

* Even though I love Respona, I can't use it to its full potential because it doesn't support Gmail's "Send mail as" feature. I believe this could be solved with a relatively simple improvement by fetching the list of allowed sender addresses from Gmail. I've already shared an example implementation with their support team. This would make the tool much more useful for Gmail users.
* The UI can be a bit glitchy at times. For example, I've occasionally encountered errors or been redirected to a "not available" page while writing emails or inserting variables. It's not a major issue, but it would improve the overall experience.
* Adding a manual opportunity is frustrating. Importing via CSV consistently fails for me, so it would help to include a sample CSV file. Even better would be a simple "Add Manual" option that lets users create an opportunity directly within the Respona interface.