I really like the improved initial setup. Especially, the ability to postpone the license activation process. It really simplifies the installation process.
I also love the revamped Firewall Rule Management. The changes make it much easier to use and I am really happy with it. Great work!
Last, but not least, I like the changes in Security & Control related screens. The smart filters should come in handy!
Now, on a personal note, I was hopeful that Sophos would add some more network drivers (e.g. Realtek) to simplify life for home users. Unfortunately, that didn't happen and so custom hardware appliances will continue to be limited to Intel network cards from what I can see. I was really hoping that Sophos would finally support all hardware supported by Sophos UTM... Oh, well, I guess I have to look into replacing my fairly new test appliance (~2 years old) sometime soon!
Anyhow, development is going in the right direction and I congratulate the team on the release of v17. Great work!