Hiya,
There is a rough zone for XP around 43-44 where you have to do a Kromedes trial run, I ran into it on my cleric (not on executor), and I've seen new to Aion players resort to asking in LFG around 40-43 for advice.
Also, If the code is backwards compatible, porting over custom skill chains would be great.
I like the changes to the classic version, excited to see it advance taking retail endgame shortfalls as lessons, I'll never play the retail version again, this is just a better game imo.