I've been waiting for this....
Part of me doesn't even care about the spec, I've wanted a Nexus 6 Android since it first became apparent how the devices were being named.
I'm totally sold on the Nexus line regardless of the name though, I'm still using my N4 which I bought just after the first stock shortage and for me it's still better than any of the competition, runs everything I want and with no noticable lag or issues. Granted, after 2 years the battery needs a charge at least once a day if not twice, but I've generally carried a USB cable for years anyway. The fact that the vanilla version of Android as it was intended (i.e. not filled with bloatware) is pushed out to my old phone within days of release means that it essentially stays slightly ahead of most alternatives with no additional cost to me, fine there are some gimmicks in the latest Samsung but there's nothing I want to do with it that it won't let me. I don't think switching from an HTC or Samsung equivalent would change anyone's world massively, but I certainly wouldn't want to go back to one. There's a reason that most (n.b. Most, not all) people who have bought a Nexus device stick with them and rave about them. They're good. They work as intended and that's mostly down to the fact they are the built for the software that's on them with no external additions. This is one of the things Apple fans appreciate about the iPhone, while I personally don't get on with iOS it cannot be denied that it all works very smoothly and that's because the hardware and software has all been specced and built by the same people.
I'll undoubtedly give in and get an N6 at some point, I'm a geek and the name alone is irresistable, but I'll do it when my phone needs replacing due to wear and tear which so far looks to be some way off.