Ranked in these QuestionsQuestion Ranking
Pro One Inbox for all accounts
All messages in one place. But you can select to show only messages from each account either.
Pro Blocks tracking gifs
Has the ability to block tracking gifs commonly used for read receipts.
Pro Quick Bar for macros
Quick bar allows you to add a variety of content to your message. It will let you reuse URLS in your Sent folder, and autocompletes against canned responses, signatures, and topics.
Con Way too expensive
Currently the price is at 45€ (US $40). That's ridiculous for an E-Mail client. The design alone is pretty but neither does that or the functionality in any way justify the pricing.
Con No support forum
Support for paid product has no online forums.