I've had the case for around 3 months now and use it to protect my laptop to and from work. I also use an Incase neoprene sleeve for the laptop, and this then sits in a padded pouch in my rucksack. Even with all of this protection, the speck case has developed several cracks on corners and it won't be long until the clasps that secure it to the laptop snap off. Clearly the material is too brittle for the application and they should use something tougher.
The case itself has stopped the laptop getting scratched, beyond that it wouldn't do much to protect the laptop from shock or moisture.