That is what I was planning on doing with the HTC One lineup and from the M8 to the M9 felt stagnant, so I went with the Nexus 6. While the M8/9 look beautiful, after a year of use, I like Motorola's build quality and design and prefer that to LG's nexus.
Its how in a sense Apple won. When I used my HTC One M8 to pay for things so many cashiers were confounded by the fact I could make payments with NFC and it wasn't till I get the Nexus did they think it was an odd a Non-Apple device was used to pay. That and the iPhone is one of the other big...
So far connection seems to be similar to same as stock 5.1. I had some bluetooth errors of commands from my alpine dash, but that I believe could be worked out.
Think I went into Sound & Notifications > Other Sounds and turned off screen locking sound and touch sounds. I responded to a different post with this advice and it helped that person with similar symptoms.
I have had this happen a lot of times with VOIP phones, I think it is when you dial someone, and hang up, the call glitches out and calls yourself instead, all the phone knows is to make a call but not to who, so it does itself.
An unlocked, Droid Turbo (Sapphire blue)without the captive buttons, with updated specs of 4 gigs of Ram, keep the screen, 64 bit processor, keep the big battery, also with htc's boomsound. A person can dream.
I don't know if hyperlinking is discouraged but I have read about this being an issue on T-Mobile and Verizon.
http://www.droidforums.net/threads/motorola-nexus-6-total-mobile-data-failure-issues-crop-up.281755/
I have the Verizon one and the guy put it on crookedly and I figure I'd rather live with it and replace it once it becomes scratched up than make a fuss. I have two things about it, one is that it looks like its either perfect or ****ed, second thing is that it feels great.