I've been testing some 6.0 roms based on AOSP/CM for the vs985 (Verizon).
ZenonHD 6.0 - Waiting for the latest build as it will fix Facebook FC, GPS and some camera issues.
Temasek's UNOFFICIAL Build Marshmallow 6.0 CM13.0 ROM - Stable, no huge issues. Still testing...
crDroid 6.0 - Has some data issues.
BetaCandy6 - Still downloading... Need to flash.
Since they aren't stock ROMs you won't see too much greatness. I would wait to flash a stock-based 6.0 ROM which should be seen in mid-December.