Manus was manageable with half a Havel set, and magic resistance ring (I was level 183). However it took a long time to wear him down, and I made stupid mistakes in my first two tries that costed me my life.
They put a fog door behind the Oolocile Township bonfire. It's the closest spawn point to beat Kalameet. I thought I could summon helpers there and defeat Kalameet quickly. I had to change plan to fight Manus first since we could only venture downwards from the Township bonfire.
Kalameet was much more unpredictable. 1-2 of its attacks could not be defended with a shield because they came from above. That's where I got into trouble. Also defeated it with another gamer.
Far fewer people leave their soul stone in Oolocile Sanctuary. I never see anyone there. I picked up a last minute helper right outside Kalameet's fog door.
The DLC is a quick refresh. It's all familiar ground now. So not much surprises. I did co-op more by leaving my soul mark everywhere I go.
In this DLC, I noticed that I look forward to invasions. The human enemies are more cunning and have more nasty surprises.
I didn't have any expectation. So this DLC definitely helps scratch the itch. I'll probably stay and help other players beat the bosses for a while.
In NG++, I'm trying to see if I could increase my endurance to wear the full Havel set, and roll around without penalty.
EDIT: Oh, I also killed every NPC in this DLC for their loot.