Congrats, just got mine last week. It really is a great tablet.
Upgraded from a 4 that I was planning on keeping until the 2015 model, but the recent BestBuy sale got me to bite. Saved $200 on my model compared to what Apple wants for it.
My old 4 could do just about everything the Air 2 can do, just the Air 2 is much faster, better to use, and easier to carry around. It is a very refined version of a very good tablet. Because its so light and portable, I find myself carrying it everywhere now.
With how powerful and light this one is, I'm hoping I'll be happy with it for two and a half years like my 4. The 4 had very impressive hardware specs when it was released and so does this Air 2. That means I'll be eyeballing the 2017 model.