I just got it today. It's really cool, infact it's probably the best wild west shooter i've ever played. The graphics are superb and the gameplay (especially with the preacher) is great.
The premise of the game is that you play as two seperate characters; a young guy that specialises in sneaking about and gunfighter-turned-preacher-turned-gunfighter who specialises in shootouts. The two characters are linked in the storyline but I won't go into any detail on that.
The only problems with the game as far as I can tell are:
1. The AI is a bit flakey.
2. Some parts can take several attempts to complete which gets very tedious.