Since you have fired it, and like it I would suggest getting a slip on butt pad. It makes shooting it a whole lot more enjoyable. I have bony shoulders, and having a metal butt plate driven into them does not feel good after a few rounds.
Oh and as far as reloading for it goes. I reload for mine, and I have 2 double spam can crates of spam can ammo. It cost me more to reload for it. Though making reduced loads for Mrs. M&P makes it worth it. She is not recoil shy. She has past back, and neck injuries. If shooting the spam can, or full power loads after 5 or 10 shots she is ready to go home due to pain in her back, and neck. With the reduced loads she keeps telling me to buy more brass.
No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.