I enjoyed Panic's polished applications since way back when but the way they simply drop paid for apps with an existing userbase due to "lack of revenue" (Status Board [1], Transmit on iOS [2], Unison [3] and Audion [4]) really left a sour taste in my mouth.
Transmit for iOS was a particularly big loss for me, so much so that I personally am going out of my way to avoid their products.
They also pulled original Prompt from the AppStore because, apparently, it completely impossible to rebuild it for the x64 target.
"Luckily" it was replaced by Prompt 2 that was basically the same thing slightly improved (but "rebuild from the ground up" for reasons unknown) that you had to buy afresh.
Transmit for iOS was a particularly big loss for me, so much so that I personally am going out of my way to avoid their products.
[1] https://panic.com/blog/the-future-of-status-board/
[2] https://panic.com/blog/the-future-of-transmit-ios/
[3] https://panic.com/blog/the-future-of-unison/
[4] https://www.panic.com/extras/audionstory/