I've been really enjoying Valhelsia structures in combination with all of the biomes, but there's a ton of worldgen problems in this pack. It's very difficult to find certain biomes; in fact the game over-indexes on humongous mountain type biomes (and cold ones). So I'm giving waystones and whatever flight mechanic you want (if any) to anyone that asks. The grind is a little accidentally exaggerated in this pack.
Err, actually, there really aren't many non-vanilla flight mechanics in this pack. I'm up to changing to another pack if nobody else is playing