Of course you should!

You may not notice it offhand b/c you may think you need twice as many miles as PLT to qualify.

But you get:8 one way systewide upgrades anywhere AA aircraft (no codeshares) flies worldwide. (and for other programs it is difficult to cash in those upgrades unless you buy higher coded fares- in AA a Q or and O fares would still be ok)unlimited domestic upgrades and no need to use the 500 mile credit and your are way ahead of the list so almost guaranteed you will be upgraded most of the time unless there are a ton of Exec PLT in your flightwhen traveling itineraries worldwide (except USA, caribbean, Canada and Mexico) you get free entrance to the Admirals club on day of travel and the Flagship lounge where available (LAX, MIA, JFK, LHR, ORD)