Nomifactory is the updated version of my favorite pack of all time (Omnifactory), which means it's also my favorite pack of all time. Completely tech-focused, tons of custom content, forks of mods to optimize the game and fix longstanding issues, progression tiering and a questbook that are intuitive and provide a clear guide as to what you should be working on next.

Additionally, building tools and blocks are given to the player essentially free, which is a design choice more packs should make! Especially grindy 'expert' packs; building is the way I avoid burnout when I'm playing packs like these, and having a chisel with durability or needing to find rare materials just to build with just makes me burn out on packs faster.

I had played the original Omnifactory before and playing this version was extremely enjoyable, the new GTCEu really improves the GregTech experience. Exploring the Lost Cities at the beginning was really fun and the grinding is present but nowhere near as bad as in GT:NH or Terrafirma Greg.

What I adore most about this modpack is the developers' relentless drive to improve it. After more than 5 years since its inception as Omnifactory, it's receiving not only bug fixes, but content updates focused on the quality-of-life of the modpack. They listened to players' experience to decide what to add.

It used to be that the endgame of Nomifactory required spamming tens or hundreds of the same machine to reach the required processing speed to finish the game, so they added Processing Arrays and eventually Gregicality Multiblocks. A single multiblock can now run up to 256 copies of the same recipe at once. AE2 without channels used to cause great amounts of lag, so it was forked to implement the optimisations and became AE2 Unofficial Extended Life. Players disliked the sided inputs and outputs of Deep Mob Learning, so again it was forked and became Deep Mob Evolution.

These forks are now used in other popular modpacks such as MeatballCraft and Antimatter Chemistry. Nomifactory is a gift to the 1.12 modded community.

Best Greg pack unless you are psychotic and want to spend 5k hours on GTNH.

Good entry level pack for people with no experience with Greg, good documentation, lots of QOL, good performance. Don't let it fool you though, this is easily a 500+ hour pack.

Very good gregpack for beginners. May take 300-500 hrs if you know what you're doing and you automate stuff.

Perfect for people who wants to familiarize themselves with Gregtech while still having a challange.
Also, this pack is less grindy compared to other GT packs, allowing you to get to more interesting parts of GT quicker.
Other mods and custom contents are integrated well into GT, making the experience very cohesive.
The questbook is clear and provides good guidance to gameplay.
Also teaches player the valuable skill of automation in modded minecraft.

Length : 150-250 Hours.

Recommended for new gregtech players.
One of the best way to learn AE2 / Packaged Auto and "passive" auto-processing.

This pack is nothing short of amazing. There might be a few gripes here and there, but overall it shines as arguably one of the best tech packs ever. It creates an experience where the focal point is pure automation and base expansion, allowing you to create a megafactory of your dreams.
There is no bloat - every mod, quest, and automation process it asks for has or will have a purpose. Quests and objectives are often very clear and consise. The pack legnth is also very reasonable for an Expert pack - unlike it's GTNH cousin.
I heavily recommend this pack to literally anyone looking to embark on a long technological journey.