Just got a replacement 12B G2, this is what I've noticed:
-Installing root/recovery is still fairly simple on 12B.
-No problems with flashing roms either (tested both TWRP and Philz Touch).
-But KERNELS will throw you a curve ball. 12B requires a separate loki patch from the older builds. PAEK refused to flash in both recoveries (assert failed: run_program("/tmp/loki.sh ==0) until I found a user-patched workaround kernel. After that it flashed fine, but it required some digging.
Right now AOSP is nowhere near 100 percent stable on the VZW G2 and probably won't be until LG gets their act together. Just something to consider. Best of luck!