Better For Sure, But Worth It?
I'll echo others in this thread. I have an original iPad, a third generation iPad and the iPad Air. I use the iPad way more than I use my MacBook, and I travel with only my iPad. In my opinion the only really superior feature of the iPad Air is that it's the first iPad which is truly as fast as a laptop. We have Verizon Quantum internet and I can get 82 Mbps download and 32 Mbps upload on the Air, which is similar to my MacBook Pro speeds whether wired or wireless. A little better than twice as fast as the iPad 3 side by side. Yes, the Air is also a little slimmer and a little lighter, but there are some negatives also-you have to use IOS 7 (hate it) and they've changed the rocker switch for volume to two separate buttons which are harder to find and use by touch.
I like my new Air because it's fast and has maybe a little better reception/antenna. Is is "worth" the extra money for buying a new iPad on a cost benefit basis? Heck no. You just have to want the newer, faster IPad-there's no way to justify the price of a new one-the Air does nothing new, just faster and with Apple's ultra crappy new IOS 7. So, the Air does not change your computer life in any way as did getting the original iPad. The Air is faster and better than previous generations, but mostly another example of Apple's marketing prowess, where small, incremental changes at huge prices still attract buyers. So, I did spring for an iPad Air just because I wanted it and because I could afford it. But, I view the iPhone 5s the same way and, for the phone, nothing could get me to buy one of those.
Probably my best advice is to save your money. You don't have to be an Apple Sheep like me. If you have a true need for speed and money to burn, go for it.