Thanks for the detailed response! That Tier Three description is what has me worried.
I wouldn't be worried if you are considering the Nexus 6. Three key things are different from the Gnex:
1. It is the same device as the other versions, not just a CDMA only one. From what I understand there is only one ROM, and not just a Verizon only one. That means if Verizon is a dick and won't push a OTA you can always stick one on yourself and be sure it works.
2. Verizon isn't pushing this phone. The GNex was considered a coup by them, they had advertisements and exclusivity deals. But then they got hit with more updates than their arcane update process could take combined with what I assume was so-so sales and the poor Gnex paid the price. Given the fact that the Verizon store guy commented to my friend that "it was the first one he sold" weeks after release in a major city I think we can assume that Verizon is treating this like a developer edition device that they aren't pushing.
3. Verizon didn't diddle with the ROM. I checked his when he got it. It had 4.1 and NO carrier anything that was offensive. As I said I think Verizon is leaving it alone, which is great.
If I was on Verizon I would have a Nexus 6 and I really really dislike its large size personally. It is the only sane phone for an enthusiast to have on Big Red, everything else decent is locked down and skinned. The exception is Moto, but I don't feel as confident about them right now. I was as bad as anyone the last year saying "A Moto X is a Nexus basically," when that OG Moto X sat FOREVER without Lollipop and the new X is just getting 5.1 now (two months after a Nexus and a month after my GPe). A Lenovo owned Moto is not the same animal that sold the first Moto X.
To me its Nexus 6 or bust. Heck it is a miracle Verizon is allowing this thing to exist on their network. Like it slipped past them or something. My friend had to tell the guy in the store that they were selling it lol.