This having been my first experience of SteelSeries products, I have to say I'm impressed.
The mat is of excellent quality - The print itself is done well, which is one of the main reasons I have stayed away from buying printed mouse mats/surfaces in the past, so I'm glad to say in this instance you won't be let down by the quality of the image.
The mat itself has a high quality cloth surface, which is very comfortable and pleasing to use with your mouse. It has sufficient glide, but also has sufficient rigidity to stop it feeling like a polished surface, so basically it has a perfect medium for any kind of mouse activity - Especially gaming. (I've been using both my Apple Magic Mouse and the SteelSeries Diablo Mouse, both of which there are no problems with).
It might be useful for some people to know that the mat is thin and floppy, not the rigid and thick type you might expect with cheaper quality surfaces. Once placed on your table, it wont budge thanks to the non-slip rubber base - The most effective of which I've ever used. I've cleaned both sides with a little warm water and a cloth, and it cleans up great and it functions just as well as when I got it out of the packaging.
I can see no reason why this mat won't last a good length of time, and considering the quality of the product I would suggest this is a good investment.
If you are a Diablo fan and are looking for a new gaming surface/mousemat or even just something cool to slap on your desk in preparation of Diablo III's arrival, then look no further.
Great little piece of kit.