The author has been working with Sentry's Ruby client for a couple of years, initially switching from a non-Sentry monitoring service due to poor performance and user experience. They've made significant contributions to the client and now work as a paid contributor. The two key features that improve error tracking are transactions and async processing. Transactions provide detailed information about where an error occurred in the application's workflow, allowing developers to quickly identify issues and resolve them. This is achieved through the Transaction API, which can be used from the moment the Ruby gem is installed. Async processing allows for asynchronous sending of exceptions to Sentry, enabling faster response times without blocking the main thread.