I've been using Airmail for over a year now, and I like it, but it still has a lot of problems, bugs, strange solutions:
1. Update conversations - is this really necessary - it should be done automaitcally
2. search problems - in version 3.0.1. it still has some search problems - doesn't show all emails, does it slow sometimes
3. When using Airmail on 2 computers conversations are not updated on both computers
4. when using on 2 computers - starred emails are not shown on both of them sometimes, and sometimes it is impossible to unmark starred email (that was starred on other computer)
Hope you will improve it