I know @ejr had a Nexus 6 back in April. A few of us have Nexus 5's
I can't justify the price or size. I was really hoping for a 5" Nexus phone again last year. Hopefully this year.
If I were to go that large for a phone I think I would want something like screen splitting to utilize the screen real estate - like the Galaxy Note series does.
Can't go wrong with a Nexus phone though! You're guaranteed the newest version of Android and about as total carrier portability as you can get in a phone these days (even Spring and Verizon!).
I'm on T-Mobile and I'm seriously considering the JUMP on demand program they just announced. Although it's basically leasing it lets you upgrade 3 times a year. I want to keep my Nexus 5 to play around with Android "M" but I also wanna play with a Galaxy S 6 Edge or the next Galaxy Note or the next Motorola phone.