By far the best storage mod
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AE2 has cemented itself as the go-to storage tech mod, and for good reason. The original Applied Energistics was the forerunner for mods like this and the sequel expanded on it in every way.
The channel system in the mod pushes you towards designing more efficient (and performant) storage systems, rather than spamming expensive block entities. Some people dislike this, but even if thats the case it's entirely configurable. Even without the channel system, AE2 is - in my experience - the most performant storage mod.
The way networks work is incredibly powerful, with subnets allowing for incredibly powerful but simple setups, allowing you to easily expand and modularise your storage rather than just making wire spaghetti.
My main gripe with this mod is how slow automating some of its machines can be, though addons solve this problem entirely. Some performance issues occur with giant storage setups, but that's to be expected and it's much better than mods like Simple/Refined Storage from my testing.
Would highly recommend for any tech/expert pack that needs a storage tech mod!