I want to, but...
My inner geek is incredibly excited. I buy a lot of stuff via Amazon Prime. Also, our phone contracts are up, and my wife's phone has been having an increaing number of problems for the last few months. We are in the phone market. Great timing!
But, there are some issues.
1) The whole 'not really Android so good luck with the apps you use' thing hurts. I would probably adpat over time.
2) Price seems steep for a mid range phone. True, the 1 year of Prime knocks a good chunk off the effective price, but it still seems steep to me.
3) Only AT&T. This is a deal killer for me. I live right by the beach, and our reception is occasionally shaky with Verizon. People with AT&T have it much worse (which doesn't really make sense, and is a subject that could be an entire article). I work from home, so can not take a step down in cell reception quality.
In the end, its a cool gadget, no doubt, but who was it that had the deal on a new S5 right now?