I purchased the pro version a few years ago and didn't use it that much as I had another ssh client that, at the time, did everything that I needed.
Fast forward to 2025 and I'm blown away by how powerful and useful Secure ShellFish is.
The ssh client is excellent (the tmux integration is wonderful) and the integration to the Files app is incredible.
I keep finding new things that I can do with Secure ShellFish.
I don't know how I would use my iPad without it.
If you access remote machines via ssh, give this a try.