Tried one at the Princes St Apple Store waiting for them to replace my iPhone 6
Absolutely hated it, it's just so huge and unwieldy, but you can't actually do anything more on it than anything either iOS device. All of the apps are just upscaled regular iPad ones.
That said, I think the same of my iPhone. I wish they'd release the iPod Touch form factor as an iPhone, if I want to do anything that needs more screen space I have a Mini 4.
I've been doing important internet related things all week, submitting CV's, doing online aptitude tests, replying to many emails and doing many online orders and processing, if I hadn't have packed my laptop i'd be stuffed, iOS is just too limited for doing any real work. Believe me, i've spent enough time in Starbucks on my iPad trying to make it work, but it just doesn't.
I run OS X, but even some of the tests held by recruiters called for IE, so had to boot into Windows. It's the world we live in.