The only drawback is that you must allow time for the rugs to lay flat before using.  I unrolled them and  have placed them face down under runners and rugs so that we can walk on them to get rid of the creases.  

Pros: Beautiful and the sizes are accurate.
Cons: The rugs are strictly decorative and have no padding or grip.  I am placing them over carpet so this is not an issue for me.