As much as I disliked the subscription model imposed on users, I decided to give it a try for a couple of years on the iPhone, iPad and Mac. While there was no single defect that drove me away, the increasing number of small defects that appeared over that period has driven me away. Examples are: Regularly forgetting account authentication details requiring them to be re-entered. The undo function not working consistently. Undoing the deletion of an email brings back the wrong email, or several wrong ones. When clicking on a link then returning to the app, the email position had "reset" to the top of the email. Rules work inconsistently. Searching doesn’t find all the emails matching the criteria. Formatting of received emails is often wrong. Emails do not conform to the size of the preview window. And many, many other small defects that, taken together, means the app is must too annoying to use, and demonstrates poor QA from a testing viewpoint.