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Pro Reduces texture memory use, including mod textures
All textures can be compressed & resized to save RAM. There are two modes of compression - basic and aggressive. Both compress to DXT and generate minimaps for all non-normal map textures, with aggressive mode having a max of 256x256 and basic mode having a max of 512x512 size for normal maps that it resizes to half the size.
Pro Can save vast amounts of space
In some cases up to 50% of space is saved.
Pro Aggressive mode eliminates the need for texture reduction packs for mods
Active Texture Management will optimize all textures to use less memory so there's no need to use separate texture reduction packs for each mod. It you choose to use texture reduction packs regardless, you might need to edit the config file at: