Let me offer another perspective.
As an iPad 1 owner, I was keen to try a 2 out and finally did last week. Honestly? If I had the money, I'd give my current gen to a family member and just buy it. Why the heck not? I could even buy twenty and make a coat out of them.
But is it necessary? Of course it isn't. Pre-launch I got super hyped up as much as the next Apple fan, and cursed not selling my iPad sooner to get a good price to trade up with... but as launch day came and went, my desire for it waned.
I think it's a superb purchase for first time buyers - it really is - but I think there is an element of consumer madness that follows and affects Apple fans. A sort of 'keeping up with the Jobs's' [sic] that creates an addictive obsession with having the latest release at all times, or feeling so last year. Nobody ever replaced their phones or computers every year to the day before the iPhone took Apple as a luxury brand name into the households of regular non-tech folk.
It sounds all very hippy, but sometimes I disgust myself when I see something tragic on the news and reflect upon my first world problem of how to procure the next iThing iWant. I love Apple, always will, they're business geniuses and make excellent products... but no longer feel the need to pointlessly upgrade my stuff every year. When a new iPad arrives with Thunderbolt and a retina screen, I'll make the leap.
So yeah... I've been running the calculations all through the night and from the test results it does appear - contrary to popular belief, you can actually live a long and happy life with the stuff you have without jumping every time Apple say so.