Just beat this about 10 minutes ago.

Took me 33 Hours to complete including all Side Quests I could find and complete (one I couldn't find a hideout to finish and moved on)

This game was seriously one of the best games I've played in a while. Great Story, Great Game Play, and there are 4 different endings. You can save before you make 1 of 4 decisions, reload, then see them all.

Also, stick around after the Credits for a little Surprise that builds up for the First Deus Ex (This game was a Prequel to the First Deus Ex Game) and also gives you an Achievement/Trophy.