Are you using an iPad4 or some version of an iPad these days?
yes, third gen
Has it completely replaced your desktop/laptop?
Not completely (still have laptop), but a lot more than I imagined it would, to the point where I'll be buying a desktop next time.
Was that the idea behind an iPad, to replace desktops and laptops?
Go from expensive laptop to iPad+cheaper and more powerful desktop, yes
If you have one, do you still need to consistently access your PC for other things?
Only on the weekends, even when it comes to audio work.
Can I use an external hard drive with an iPad for storage?
No
I'm not seeing a USB, so....
Many audio interfaces work with the Apple Camera Connection kit, such as Roland Duo Capture EX, or the Focusrite iSolo works with the dock connector
What are must have accessories? Case, cover, stand? I'm not worried about apps yet.
Case.
What exactly is the benefit of a "cellular" version?
Anytime, anywhere Internet at high speeds with LTE
Does anyone use an iPad plugged into a larger VGA screen? Is this easy/common?
I don't, but it works fine.
Is the external keyboard a necessity?
I don't think so. I use it only when I travel for work.
Looks like it'll run around $700.00 Worth it???
I think so. The portability and battery life are stellar, and the main reason why I love it so much.
Court Jester of the Ibanez Wizards
Mesa/Boogie Mob
Guitars:
Ibanez JS2000
Ibanez RG421 w/ Dimarzio TZ+AN
Ibanez SC420
Fender MIM Strat with built-in Roland GK3
Seagull S6
Rig:
'94 Mesa DC-5 combo
Palmer PDI-09
L6 Echo Park
Boss chorus
Boss SD-1
AmpKit+ for iPad
Roland GI-20 MIDI converter