Hallo Peter974,
LineageOS is based on Android 7.1.2 at the moment.
The update process went pretty well, you even do not need to re root it after every update.
I use it on my FP2, SGS2, Samsung Tab 3 and Note 8.0 and I do not miss anything or have trouble with it.
Yes, the FP2 is affected by the reboot issue, but that happened just one time in a few days. Mostly at night in my case. But after the reboot the alarm clock never failed.
Yes! I was faster than @paulakreuzer =)