I was quite happy wit NeatROM v6, have used it for two weeks or so, even dared to switch to ART and no problems at all. Well, actually the usual wakelock of Evernote which is extremely annoying and I'm looking for ways to prevent it.
Two days ago I switched to NeatROM v6.4.1 and also to ART and I must say that I am not impressed:
* the battery hold time seems worse, with v6 it was on average 2days, now it is 1d10h.
* When I tried to install GSam Battery Monitor and the root companion from PlayStore (with battery at 60%), it rebooted the phone and then the battery ended up at 5%! This is a hell of a drain.
* I suffered a hard freeze: could not wake up the phone with the buttons and it was a bit hot around the chip. I had to remove the battery in order to reboot and to restore NeatROM v6. I still have not identified the reason for this freeze (I have not installed Evernote yet).
Note that I did the usual way of clean install (full wipe, clean cache etc) and installing the new gapss.
So, for the time being I'll stay with v6, it's very stable.