Very mixed. I hadn't done any app development before this project, only games with Gamemaker and the Godot engine. Coming from that background, SwiftUI was very easy to pick up. In general, if SwiftUI has the feature or UI element you want, it's super nice and concise. If it doesn't, you're pretty much screwed. Also, Apple doesn't really understand the term "backwards compatibility" when it comes to SwiftUI. Without doing a ton of work on workarounds, I was only able to target Ventura or newer.