This is probably useful for the few people, but good price consider it probably cost that much just to deliver the box alone.
Feel the game
Add to your ProGamer or Starter system
Air and vibration synch with the game and bring it literally into the room.
Air and vibration to max your game
Up to 5000 RPM variable speed fans and rumble pad
Every impact, kick or shot is felt as gamers play with the game-activated wrist-rumble pad. Speed and movement are realistically simulated by two desk fans. Combined with the light and sound effects, it creates an incredibly intense gaming experience.
Connect, install and play
Easy plug in the wall washer
To connect the extension pack components to your Starter and ProGamer kits
Extends Starter and ProGamer kits
Two fans and a rumbler to add air and vibration effects to Starter and ProGamer kits
The premium kit is also available for £69.30, which includes the 2.1 speakers and this extension kit and (I think) a couple of games.