So ...glad I found this thread, as I was going to create my own (though I think general might be a better place for it...I'll suggest to mods).
Hopefully this can be a good place for all of us VZW M8 users to discuss our LOS experiences.
I just started looking for a new ROM after months of hating the stock MM update. I'm hoping to get another year or so out of my M8.
So far I have narrowed it down to:
NuSenseSeven - A really nice Sense 7 MM build that doesn't seem to have the performance issues of stock MM.
Wolla - Nice clean Sense 8 MM build with a healthy collection of tweaks to configure.
Lineage (LOS) - Nougat build for M8 (only one?). Clean, fast AOSP-like ROM with ability to build extremely light and add what you need from gapps.
So far these are my main issues with Lineage after trying for only a few days:
Not HTC specific. So you are going to lose out on some HTC tools and menus. Something like HTC Connect to cast media, or the comprehensive gesture support HTC has. Some of these you can get back through third party apps, but not all of it and not really as well integrated as you get with HTC/Sense. There are about 5-10 things that a ROM like Wolla has that I can't find the same settings in LOS. Basically I'm deciding if I want to lose out on those to get the benefits on being on the latest possible Android for the phone.
Right now I'm leaning 80% yes on LOS, but I might decide to go back to Wolla or NuSenseSeven. I would need to do some more testing between those two before I decided on which one though.
Although there is a lack of some features in those ROMS, there are other features that you will only get in LOS like the updated Nougat notification system, Privacy Guard, and maybe a few others. So you need to choose what is best for you.
As far as speed/stability/etc. So far I have been really impressed with LOS, though all builds I mention have been way better than stock MM in the few days I've been testing. Here are the only known issues/bugs that I have had with LOS so far:
1) NFC icon. The NFC icon doesn't appear in the status bar, so you can't see at a glance if it is enabled (you can see it in quick launch though). I think this is a regression and there is a bug listed for it. I actually haven't tested the NFC yet though, but it appears that it works, just no notification icon.
2) Double list of APN in mobile settings. This is just a display bug...for some reason the menu option is there twice.
3) I too have had some data/connection issues, but I am not ready to rule the ROM as the issue yet. Basically on the quicklaunch bar it was showing my data connection as "No service" instead of "Verizon Wireless." It would say Verizon sometimes, but not always. I couldn't tell if this was an issue with the display or not because my other ROMS didn't have a comparable icon, so I had to start looking at the hidden phone menus to see what my connection was saying. Sure enough, my phone didn't appear to be getting a carrier name listed when I was using LOS most of the time, but it was there all the time (at least all my testing time) on other ROMs.
As I was trying to compare/troubleshoot this by flashing different ROMS and radios at some point I got to a point where my 4G wouldn't work at all (stuck at 3G). This was the case even when flashing back to pure stock everything. I spent the better part of a day working on this and couldn't find the solution until I found a few other threads of people discussing no 4G connection and the only solution was a new SIM card. Sure enough I got a new SIM from Verizon today and 4G came back immediately. I reflashed LOS and on boot it shows I'm on Verizon, so I'm hoping it stays.