I've recently been using it and I am very disappointed. Some tasks that should be totally trivial are incredibly hard to get right and require platform specific solutions. Nothing unsolvable, but I was expecting a much more straightforward experience from a product that has been promoted as the cross platform toolkit since the 90s.
I co-developed a Qt C++ app of ~40,000 lines. I think the amount of platform-specific code was at most a couple of pages (handling macOS' behavior to keep an app alive when all its windows are closed).
It is not perfect, but it feels a lot more native on every platform than virtually any web or electron app I have seen (including predictable keyboard shortcuts).
I don't have a large amount of experience but when I worked with Qt I was blown away with how friendly and cross-platform it all was. It's pretty close to write once, compile to anything.
