The only thing negative I have read of late is the 6 plus crashes is you have over 700 app's installed. I am still trying to figure out who installs 700 plus app's, I do not know anyone.
Just a comment about where to get it. If you get it at Costco it is less than most other places, and you have 90 days to return it. If you are a California Resident, you are aware you pay sales tax on the full retail price, even if you are getting it with a 2 years contract. At Costco you only pay sales tax on the wholesale price, so you save a little bit there. I do not work for Costco, nor do I have a financial interest in them.