Just flashed 8.2 and everything works great so far. GPS signal is strong (tried Maps, Runtastic Pro and Ingress), dialer is working, performance is great so far.
Might be pure luck, but I never had GPS working indoors this quickly.
I also had issues with Link2SD. So I tried to mount the 2nd partition (ext4 - created on Arch Linux with mkfs.ext4 v1.42.10) of my sdcard manually. Which failed. I could resolve it by running mke2fs /dev/block/mmcblk1p2 on adb shell though. Seems to me like some ext4 features are not supported in the kernel.
I will try to find out more about this, since I'm stuck on ext2 for the moment.
Update: A ext4 partition formated with AParted works fine..