Hello
So I have not used blender in a while (last one I used was 2.68) and I found out about a feature called Mean Crease, which essentially creates a sharper edge which is useful when you have a subsurf mod on your model. I was wondering when is it to use the mean crease and when it is better to just create an edge close to the edge you want to sharpen. A list of pros and cons for both would be most beneficial. Thanks 
okay this is a list of stuff i can think of.
mean crease
Pro
really easy to use
allows sharp edges without adding more vertices
its easier to do corners with
not sure about any cons
i think the main thing is that you can easily adjust this later on if you want.
hope this helps
There is one main con, and that it you might need a high subsurf level for a smooth edge.
That might change though as the BF continues work on Blender’s new integration of the OpenSubDiv library so stay tuned on that.
This video from Blender Cookie might also be helpful:
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