Even though I enjoy both my ipads, one full size and a mini with cell/wifi on it. But they don't replace my laptop when traveling. I currently have 7 Apple devices on my AT&T account with 10 gigs of data per month, shared. In the summer months of traveling, we get close to maxing out the 10 gigs and have gone over a month or two.
I gave up on Apple computers many years back and have all PCs in the computer category. With the iPhone 5 camera, I find I am using it more and more to take photos. it is about as good as my stand alone cameras for most photos. Not all, but I carry a few Canon cameras for special needs, such as telephoto, bad light, haze filters, etc. Then when I get the iPhone and iPads on the same wifi network, the photos I took with the iPhone will cloud over to the iPads, automatically, with the settings I use on all three. I keep most of my music, photos, documents, etc. on my computers, the laptop I travel with and my two desktops at home.
Photos I take on the road, with the Canons, I first download the SD chip to the laptop, much easier for me to make any needed adjustments needed to the photos. Then when I get home, I download the SD chip with all the photos on it to my main desktop, then connect my iPhone to it and sync the phone with the photos I want to move to it, but don't put all of them. On my IPhone and iPads, I only have 16 gigs so space is usually a problem for me. (doubt there could ever be enough storage) I do wish that Apple would allow micro SD chips to be inserted for extra storage at a reasonable price, like many of the Androids allow.
Once I sync my iPhone to my desktop, the new photos, etc will cloud over to the iPads on my home wifi network. The last time I checked, I had just over 30,000 jpeg images on my desktop hard drive and backup external drive.
I also don't keep my full array of apps I have purchased, over the years, on my devices all the time. They are on the iCloud, till I need them, assuming they are still available for sale on the iTunes iStore. I have had a few disappear off my iCloud, when the developer of the app, no longer has it for sale, after their required time period has expired.