Congrats on the release, it's a very impressive piece of software. I've been using the beta on and off or a while and it's clearly very stable, fast and polished.
However, I was very disapppointed by the decision to have only a subscription model for an email client, which my local currency exchange rate makes even worse.
I miss the times when I could simply save up and purchase some software. Nowadays everyone wants $5 or more a month, which is unfeasible.