The iPad is no replacement for an MBA. Those who think the iPad can replace their MBA never needed a COMPUTER in the first place. The iPad doesn't do computing... it does entertainment observation.
As I stated elsewhere, the iPad isn't great at anything other than nice battery life and being extremely portable. It simply fails in comparison at any one thing like using it as a book, to watch movies, check email, type a book, surf the web, play games, compute, listen to music, or run Mac OS X applications.
The iPad's advantage is it does everything half-assed! That's the truth...
Read a book - too bright (fancy with gimmicky page turning) and inferior to Kindle and Nook.
Watch movies - too small and annoying to hold in the right position.
Check email - if I want to check email on the go an iPhone is better. If I need to reply to an email in depth, my MBA is better.
Type a book - please, without a physical attached keyboard it's grossly inferior.
Surf the web - without Flash it's a fail. It doesn't matter why or whose fault we cannot see even content on websites (don't blame SJ, don't blame developer for using Flash, and don't blame the coder who implemented it - as 98% of all web capable devices had Flash installed as of last year). The bottom line is it's a fail. It doesn't matter if we take the assumption that SJ is doing the wrong thing or the developer shouldn't use Flash at all, or the coder shouldn't have used Flash for content or navigation. The bottom line is without Flash the iPad is a fail for Internet.
Size - it's too big to put in a pocket and too small to really enjoy the display and its inherent qualities *being IPS.
Materials - feels great, but what does one look like after dropped? I plan to give mine to my young daughter for as long as it lasts... while aluminum is beautiful, for an entertainment device I believe Apple should have picked a better case material. We have seen this with the plastic MBs over the MBA/MBPs that are aluminum. When a plastic MB is dropped, it's usually not that big of a deal. When an aluminum Mac is dropped, it's often $1000 or more and Apple most of the time voids the warranty.
Play games - one cannot tell me this is better than a Wii, Xbox, or Playstation... better than an iPhone, maybe.
Compute - please... what a joke.
Input or Creation - not this Apple product.
Music - too big to carry along. No real improvements over an iPod.
Mac OS X apps - let's face it this is no Mac. One who uses a Mac for work/creation/input simply cannot replace a Mac with an iPad. The iPad is second rate at everything it does.
So where the iPad really achieves greatness is if one just wants a device to "sorta" do things, or do them half-assed!