Depends on what you mean by that. I have always had a Mac, so it's not replacing the iPad for me, but rather possibly allowing me to go without an iPad due to how light and portable it is.
Well I have the top spec rMPB but am super tempted with the new rMB
well... When i'll be able to get my hands on one. I'm quite sure it will replace both, my rmbp and my ipad. Which is an ultimate victory. Power of the os x and proper computer hardware in almost ipad size package is priceless.
This leaves me with only rmb and iphone which is quite optimal.
If so, how have you coped with the transition. I love my iPad which I use mainly for web browsing and just wondered how the new macbook compared.
I plan on buying one, basically to replace my iPad Air. I never really warmed up to the iPad due to its limitations and the lack of a keyboard so the form factor of the rMB along with full OSX functionality is really a no brainer.