I used an iPad for three years (when traveling only). I grew to hate the darn thing. To me, it's a toy, not a computer. Last August I sold it on Craig's List and picked up an 11" MBA. I couldn't be happier. The form factor couldn't be better, IMHO. I luv it.
However, I made a BIG mistake. I bought it with only a 64GB SSD. My idea was to use a 500GB Hybrid drive when I was in a hotel room or visiting someone and to use the small SSD only for internet use while moving about. Didn't work. I bought a 480 GB internal SSD, first from OWC, but had problems with it, so it's being RMAd and I have a Transend 480GB SSD that should be here next week. Being able to put all my files on the internal drive and use it anywhere is GREAT!!!!
My home computer is a souped up Mac Pro. But the MBA is a GREAT little machine. iPads =BAH HUMBUG - IMHO