Just started working my way through this and I've only done the first 19 levels so far so SLOW progress.
After watching namida's videos on this pack and getting the hang of the hotkeys in NeoLemmix, I thought I'd give this beast of a pack a try.
I'm not confident enough to video it though because some levels in this pack looked brutal.
I enjoyed watching namida's videos but since most of his backrouting has been fixed in the updated version (1.2), the final few ranks will be more challenging. Chances are I'm not going to remember most of the solutions anyway!
Anyway, I'm liking the vast amount of music and graphic sets included in this pack, especially the music tracks from Lemmings Chronicles (they are great tracks)
I'm currently recording an LP of 3D Lemmings for my Youtube channel but when that's done, I may be moving on to doing custom level packs in NeoLemmix as my next video project. I think I'll be a long way off recording this pack though!