Most cohesive modpack I've seen, ever.

Played through the early game a couple times but haven't finished it yet, have seen a few videos though so I know all about the later game stuff.
Recently got a friend into modded Minecraft and began replaying this and, man, the atmosphere of this pack is unmatched.

The quests are all meaningful and give new info in each one; from what I've played through, there's never any points where it slows down as long as you've got your automation done. The real gripe I've seen is with that automation; if you don't plan ahead and automate everything by Chapter 5 you may have a tough time completing the pack, however in the early and mid-game it's a consistently smooth experience.

The main way you get resources is by looting whatever miscellaneous items you can find around the seemingly infinite stretch of space that is the backrooms. Furniture for wood, silverfish hiding in the floor for food, damp carpet on the floor for water, concrete under the carpet to get lava, and even various real-life tech like microwaves and pipes to get metals later. No(well, minimal) mobs spawning means it's easy to get lost in the looting frenzy. It drives you crazy the way you think, "Well, maybe if I just go down this way there'll be something good..."

Create is the main gateway to the early automation; the buffed steam engines are a lot more fun than spamming waterwheels, which you only unlock later.
This may not seem like it, but it is in fact a Create pack like Arcane Engineering or Above & Beyond, so that's a big focus until close to the end; even then, there's a lot of recipes involving spouts, presses, and mixers. Whether that's a positive or negative is up to you.
Pretty much every crafting recipe is redone to have something to do with the items you find scattered around the backrooms, adding to its cohesion.

As I mentioned earlier, the aesthetic design is unmatched by any other pack. It's unnerving without being completely jumpscare-y, no dwellers or "noodle" monsters like many other versions of the backrooms have.
Visually, the textures are all really nice-looking and consistent. All the mods with "vanilla+ textures" like Farmer's Delight or Create feel very consistent together, and the later-game stuff, although unchanged visually, also feel like they match with each other.

Performance is pretty decent, I had no problems or anything. I've heard gripes with some of the loading in stuff and the sculk mobs , but I had zero issues personally.

I'd recommend this pack to everyone even remotely interested in tech; I don't think it's a good beginners modpack, but if you have a friend who plays modpacks and knows at least the basic mods, I would definitely recommend it for multiplayer. It does assume you have a bit of basic knowledge on how some stuff works, especially Create as I was saying before, but nowadays with pondering, guidebooks, and the pack's great quests, there's not much you can't figure out in-game.

TLDR; if you know anything about tech mods, play it. It's worth it.