Sunbreak is extremely good, the ability to have two switch skill loadouts and switch between then in a second is game changing for some weapons. I don't play long sword so I can't comment on what it does for that weapon though.

The new monsters are super fun fight and it requires you to eventually get very good at knowing your op counter bullshit to win the final monsters they added a year after release. Maybe some people don't like that but I had a blast with dual blades.

Replaying on ps5 now trying to learn charge blade.