I definitely use my iPad more than my computer. I can do about 80% of my computing needs on the iPad. I will always have a full desktop computer, there is no way that I could transition to iPad only.
unless all you used your laptop or desktop for was surfing the web and email I cant imagine how an iPad can replace it, I only use my iPad for surfing the web when I am on the couch or in bed or anywhere the laptop is not comfortable to operate, and for iOS games.
I find using my laptop to be better with content creation then the iPad.
I don't use a physical keyboard for my iPad but I have no problems with my MBP keyboard. Once you get used to it, it's awesome. But to each his own.
My iPad Mini has replaced 80% of what I did on my MacBook Pro. Still love my MacBook tho just easier to pull my iPad out for email and web browsing.
unless all you used your laptop or desktop for was surfing the web and email I cant imagine how an iPad can replace it, I only use my iPad for surfing the web when I am on the couch or in bed or anywhere the laptop is not comfortable to operate, and for iOS games.