Ranked in these QuestionsQuestion Ranking
Pro Has introduced features that are not available in better-known apps
Like a 'new generation' app - quite a revelation in simple addition of various emails from separate providers with different forms of password/2-step/other verification and sign ins - all failed by many better known apps on this list.
Pro Beautiful UI
Pro Open Source
Con High memory usage
Hige CPU and GPU usage for a mail client. Some computers may struggle and be slowed down by it.
Con Weak support
Bug fixes take too long to be released.