Specs are quantitative aspects of the option such as the price
Pros
Pro
Great game play
You get a huge arsenal of unique weapons and tools that keep Undying in a league of its own. The ability see ghosts and secrets with the scrying stone is very cool.
The world is crafted with great detail that still holds up today. Large levels to explore in a variety of locations. Much of the game revolves around a haunted mansion, but you are not trapped in it for the entire game.
Clive Barker is one of the best modern horror writers and it shows in this game. The story is long and complex that just keeps you playing to see what will happen next.
Be warned, the game ends as if a squeal or level pack was in development, and leaves some questions unanswered. But to be fair, that is a staple of gothic horror. Life is not always about happy endings.