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Took out old springer vs new and played around. Here are my thoughts.
Siege springer, in robot mode, is far better. The only two things the old one has that the new doesn't is a slight increase in shoulder range, and wrist curls due to transformation.
Siege has ankle tilts and tighter shoulder joints. Some of the joints on generations are ratchets but really don't need to be. Also, their not that different in height or weight, siege is just a stocky guy and generations is lanky. Gens shoulder joints are loose by comparison though.