I currently have a 15-inch Retina MacBook Pro, that I'm considering selling. I'd like to hear MR's views on if the iPad 4 could replace its functionality.
I am a college student, and I write papers, prepare presentations and do regular computer stuff. I don't do anything other than email, web browsing, calendar etc all of which seems to be able to be done via iPad 4.
Anyone have any points I may have overlooked?
While technically all your needs can be achieved via an iPad 4 (even an iPad 2 for that matter), its a matter of how hard do you want to WORK to achieve those goals.
With Pages and Keynote on an iPad, you can edit long documents and do entire presentations. But you will find the functionality limited, as both programs are essentially handicapped versions of their desktop counterparts. You can augment this a little by adding something like OmniGraffle for iPad to your device, which lets you do a lot of drawings and such that can be inserted into the Pages document on the iPad. But do that requires more than a little gee-wizardry (DropBox saves, copy/paste between apps, etc.) and when its all done you will find the same work taking far longer to do on an iPad when compared to doing the same on a full OSX or Windows laptop.
When my daughter went away to college, I outfitted her with a Macbook Air. Its almost as small as an iPad, has a full keypad and the apps/OSX are just far easier to use for more complex tasks. She also has an iPad2, but that's more for eBook reading and/or marking up notes on the PDF presentations that her professors/classes distribute. That combo works well for her, although she tells me she uses the MBA much, much more than she uses the iPad for classwork. The iPad is a "nice to have" supplement, but not her go-to device.
So I guess it depends on what you are willing to sacrifice more?
-If money is no object, get both an MBA and an iPad. You don't even really need an iPad 4. A Mini or an iPad 2 (or refurb'd 3) would suffice.
-If time/workarounds are of little concern to you, get an iPad, buy yourself an external keyboard and a case to carry the two, and learn to embrace the mouseless world of content creation. Its a challenge but if your needs are simple, its a simple challenge.
-If you just want to get work done, get a laptop. The littlest MBA netbook variant would be more than fine, a 13" full MBA even better and, for my money, a 13" MBP (non-Retina) a good compromise between the two. Save your money for an iPad when you can afford a luxury item.
-Don't sell your MBP 15", buy a refurb'd iPad 3 or an iPad 2. Second cheapest alternative and you still retain the best of both worlds. Invest in a good stylus or an external keyboard for taking notes on the iPad in this case and make it your classroom rig, then keep the MBP in the dorm or apartment as your "homework" rig.
Good luck in school!