Took me about 45min and it makes a huge difference. Installation was a bit of a bitch because I thought I had gotten the snap-on rings, but they weren't so I had to use super glue. Luckily, I didn't leave to much of a mess. Really good purchase, I recommend it, but spend the extra dollars to get the snap-ins from bimmian.ca .
Other than that, taking out the cluster was extremly easy, thanks to RMKBMW for his detailed instructions.
Here's a pic: