My wife and I made the jump this weekend to iPads as our primary computers. We have an iMac at home and that will serve as our main computer, but most of our work will be done on the iPads.
I have an older MacBook Pro, but that will now be relegated to working with my wife's craft paper cutter. It is an older one and was starting to bog down some, though Yosemite did improve the speed.
The reasoning is that all the things I needed from a computer I could do with an iPad. The same with my wife. We didn't need the extra $500 to $1000 on a laptop. The iMac will be the hub and with cloud apps and iCloud it will be an extension of the iPads.
Looking forward to the next chapter and will see how it works out.