Heroic bosses.. kinda tough
Well if you like a challenge I suppose this is the place to do it!
I did two of the instances no problem in the past few days. Both Plane of Fear are totally boxable. A few tricks here and there but getting into the Sleeper's Tomb area... it gets kind of messy.
Some of them I'm not even sure are worth the time spent. There is a lot of knockbacks for the entire group and putting all characters into a wall is either very difficult or not possible due to the encounter.
It's also very hard to find information online on the bosses themselves. End up having to chat with players in game to extract the mechanics which makes it interesting. Just giving a follow up about what is going on in the EQ2 world :)