the 709 is built to take Plus p loads, the more you shoot them the less the life of the gun, springs etc that you can expect.
Now to each their own but i am not a big fan of plus p in any caliber, including the 9MM personally.
the 9MM in a standard pressure round delivers about 400 ft pounds of energy and has typically more than enough pentration , especially in the 124 grain weight, there are a boat load of new design projectiles that do a great job without added muzzle flash and muzzle jump, such as Hornady XTP, FTX, Speer gold dot, Gold dot short barrel.
the 9MM is a 9Mm is a 9mm if i wanted more power then i would get a more powerful round myself, like 40 cal, 357 sig, 38 super, 45 acp, 40 & W, 10 MM.
call me a sissy but i shoot a 92 grain projectile and its NOT a plus p round in all my 9MM's.
The key to all of it is does it function 120% of the time in your gun, can you place the projectile(s) in the target where you want them, everything else falls behind this.
A miss with a Plus p is still a miss.