If you bought the pack originally, it would cost you $767.63 USD but steam are selling it for $99.99 USD saving you $667.64! I guess the only thing worth while is Magicka which is also 50% off (Plus all the Magicka DLCs are 50% too if your in to that kind of thing)
If your a fan of Roller Coaster Tycoon And Transport Tycoon type games, then you must try Cities In Motion by Paradox Interactive, that is included in this pack. Fantastic game with incredible transport and human realism.