The quest for the World Engine(and a whole lotta chickens!)

One of the first packs I've actually completed(although I'm not quite at the end lol, close enough!).
Unlike most similar packs there's no sieving or ex nihilo-esque stuff of any kind, there's a very unique early game that uses vanilla brushes, with a bit of villager slavery to automate it later.
The whole pack is centralized around crafting with and upgrading a device known as the World Engine. The texturing and theming for it is great, and it's not the most intuitive thing in the world at first but a very great questbook gives you enough to figure it out.
Speaking of, the questline feels great. It's got a sort of asymmetrical layout where you work on three different quest chains per chapter, and at the end of each questline is an upgrade for the World Engine(which unlocks new crafts to progress through whichever mods you want or need). Completing each quest gives a bit of money to purchase things at the spawn's shops. These shops are fully voice-acted characters which you talk to throughout the quests.
The quests are not fully exploration or crafting/techy stuff, I think there's a great balance. If you get bored of one or the other it's great to have two other quest chains to go through.
Mods are a nice mix of the ol' standards and some I hadn't really heard of until playing this pack. You've got your Mekanism, Ars, AE2, Apotheosis, etc.; Create is here but not super necessary like in SB3 or a lot of other packs, which is great. Two great mods that were new to me were Just Dire Things and Roost Ultimate.
Exploration is a mix of custom dungeons and bosses, mostly L_EC or Twilight Forest. The dungeons are all themed around one specific thing; there's a Create dungeon, a Portal dungeon, a puzzly MFFS(a forcefield mod) dungeon, etc. which are all very fun to go through.
Overall, progression never felt blocked in any way. It was like when going through a certain mod for the questline you'd watch a great cutscene as your World Engine grew and gain access to everything you'd need for that mod. The grind is minimal, and AE2 is very much buffed so once you get autocrafting it becomes even less tedious.

This pack's 100% worth playing, even if you're not a huge skyblock enjoyer I think it's worth it for the custom stuff alone.