A.  Application and usage less than 10 days. Unable to judge long term usage on floor.
PROS: B.1.  Pad will definitely stop runner and rug slippage.
            B.2.  Size good fit to runner. No trimming. Easy to apply, best with 2 people.
            B.2.a.  Size to 8X10 rug issues. Trimming required.  Application much, much easier/faster 
                        with 3-4 people.
CONS: C.  Rug width folding distorted unfolded size adversely impacting application to rug.
             D.  +++Nicety for DIY would be a video showing a well applied easy application, start to 
                   to finish, large rug.  Think YouTube and the millions of self-help viewer reviews.
             D.1.  A great pre-planning hint would be to have the final placement position marked 
                     at corners, or even full outer position,  with a light tacky, easy removeable paint 
                     tape.