I ended up getting frustrated with the amount of time I had to touch the screen to do stuff. Is that any better with the later versions of iOS in terms of integration?
As someone who uses a 12.9" iPad as their primary device I can say this has not changed and you should be prepared to get frustrated.
iOS is still my favourite operating system, but text selection (cut, copy, paste, etc.) sucks. Switching between apps (Cmd-Tab) is slower than on a desktop OS. And sometimes there's simply no way to do something other than tapping the screen.
You get used to it, but Apple definitely could make it better.