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Pros
Pro Uses Blender's User Interface
Pro Try before you buy
Real world modules are both included and purchasable for a small fraction of the cost of hardware.
Cons
Con Lots of manuals to read
Just like real modular, every module will have its own manual, likely written by a different person with varying levels of consistency. In some cases like the Mutable Instruments clones, you are expected to go download PDFs of manuals for the real hardware.