I was very satisfied with Airmail 2 at first. Possibility of using colours for each folder, e-mails regrouped into conversations (not just by subject), etc. However, I foud a couple of bugs that really bother me.
Firstly, in a tread of e-mails, I’m not able to delete a single e-mail. It deletes all of them. Yet, I can respond to a particular mail in the thread. I also prefer the way Outlook indents e-mails in a thread. Instead, Airplay 2 simply lists all mails as a single e-mail, and it’s quite difficult to distinguish one e-mail from the other.
Second, when I rename a folder, the folders do not get automatically resorted in alphabetical order. You need to restart Airmail 2 for this.
And finally, when in full screen mode, new windows appear in a different desktop. I believe this problem appered only recently.