My Kingmaker playthrough continues and I can safely say you should not bother with Varnhold's Lot DLC. If it was mostly episode of the week adventures like it was starting off as with little main plot build up here and there, I would be down with it, but this last dungeon takes up like over half of the run time and it is so fucking annoying.
It's mostly extremely obnoxious to trigger fey fights where they initially appear as random people in the worst disguises ever that serve only to run out your buffs, and enemies teleporting to the back of your line from nowhere. It's not hard necessarily, but it is really annoying and a sort of vortex of all my least favorite parts of Kingmaker's dungeon design rolled into a slog of misery.
God help you if you picked default companions or fucked up character building.