The only concern I have is QC. With the iPhone it is very easy to swap out at the Apple Store if there's something wrong. From what I've heard in the past, Google's support leaves a lot to be desired.
In regards to the device I don't have many concerns, surprisingly, I think it looks great, the specs are good, and the lack of LTE isn't that big of an issue for me.
The one thing Apple has that is utterly immune to attack from the competition is their customer service.
I don't think anyone will ever top them. It's something I do miss (for my smartphone, anyway).