I also haven't played it since release and I'm a little hyped for a possible sequel so I went ahead and grabbed the PC version considering it's only 3 quid on steam ( Thanks for posting that @MrCunningham
).
It's worth it for that price. The American Nightmare expansion is a nice addition too. But it can be completed in 4-5 hours. It does feature more Mr. Scratch, and the levels try to be a bit more open-ended.
The game still looks pretty damn good on PC too. It is a 2009 Xbox game ported to PC in 2012. The pC game does have some updated lighting for 2012, the ability to play in higher resoluts and 60fps capped. While the 360 original ran at 30fps. Because Alan Wake uses another iteration of the MAX-FX engine, (update on the Max Payne 2 engine) keyboard and mouse controls are really good. The game feels just like Max Payne set in a survival horror setting.
There is no bullet time, and in Alan Wake ammunition is more limited, and you have the flashlight/ light weapons. It wasn't what they initially promised when they announced the game on PC. But MS funding pushed the game to being a 360 exclusive. I could imagine that they had issues working with 512MB of memory. But it still is a great TPS style survival horror.