The fan cools the Xbox outstanding.
Disadvantage: It is a bit noisy and switched between by rarely from. (Is it the but also the XBOX 360 S enough heat generated)
If you've played for a while with the Xbox is no longer one perceives the fan. You get used to halt it.
The best fan if man wants to stand the Xbox vertically or must (wall unit blows the air to the front)
Personally, I prefer vertical storage of Xbox.
All in all, Ok as it is.
Another thing to Microsoft even if it's not here ago heard: How stupid are your Inge kidney to produce such a heat extractor ????
This is definitely better.
Conclusion: Buy !! With this fan your Xbox360S dies does not guarantee the heat death !!!