My first M&P was around 2007 or 2008... I heard the range staff on my department was testing them so I bought one. It had some reliability issues and I ended up selling it. Fast forward to early 2011 and I bought an M&P9C for backup and off duty use. I actually carried it as a backup a bit but mostly off duty. Later in the year my previously broken trigger finger started to not work so good and after a time I couldn't pull a DA trigger very well. I purchased an M&P9 and avoided going light duty again.
I didn't say anything about my trigger finger because I was in the process to potentially be promoted to a full-time firearm instructor with the Weapons Training Unit. That ultimately happened in October of 2011. At the time they didn't have instructor pistols (the M&P was, at that point, our issued pistol to recruits in the academy) so I continued to use my personal M&P. During the ~ two months between mid October and Mid December I tracked how much I shot and it was over 15,000 rounds through my M&P... Since I wasn't "on the street" any more, I thought it would be a good experiment to not clean or lubricate the pistol to see how long it lasted. It lasted the whole time with no issues.
In December we were issued instructor guns. I used that pistol for a year (trigger finger got fixed in the meantime) before it was switched out for the "new" 1.0 guns we were getting for the department conversion. I also turned in my issued Beretta 92FS to be issued an M&P as my official duty gun. I bought the Beretta six months or so later once the department was set up to sell them back to us.
A year or so later I ordered and received two M&P9Ls and used them for a long time... but eventually moved away from the M&P platform... sorta.
In 2017 there was controversy and a push to move away from the M&P. I don't know the motives but I felt it was not based on what was best for deputies or the department. As part of my frustration I embarked on a torture test of my instructor gun. It had already gone several years without being cleaned or lubricated... several years and around 30,000+ rounds.
I threw it in a creek. I buried it in sand. Ground it in mud. Started spraying it with salt water every day. Threw it in a deep mudpile. Had a class of recruits shoot a full magazine as fast as they could - one after the other - for around 350 rounds... the gun started to melt the plastic chair when set down towards the end. By the time I was done the original recoil spring had broken a coil (around 35,000 rounds) and I put in a new recoild spring assembly. The pistol had over 40,000 rounds and had only choked when I poured really fine sand directly into the gap between the slide and frame. funny thing was I put a drop of Lucas oil on each frame rail, on the barrel hood, and on the trigger bar tail... and it started running again. That was probably around 37,000 rounds.
I'll admit... the M&P 9mm 1.0 pistols weren't the most accurate, and I wasn't super happy with the bump-loading, but they were frigin' tanks!
Then the department moved towards the 2.0 to "fix" things I didn't think were broken about the 1.0. I was so mad I avoided the 2.0 entirely for the testing process (I recused myself since I was already biased against the whole thing) and refused to shoot a 2.0 for almost a year. When I did it was a pretty big shock... these guns were FANTASTIC! I ended up buying several and then we moved toward optics so I picked up several 2.0s with optic capability and a 1.0 frame to mate to a Simunitions slide assembly for Force-on-Force training. My last M&P purchase before I retired in September was a 5" 2.0 Pro Optic Ready and it is awesome.
All in all, before today - and if my recollection is correct - I've owned 18 M&Ps, all in 9mm, and a 9mm Shield.
Today my wife and I went to a local pawn shop here in East Tennessee and there was what appeared to be an almost NIB .40S&W M&P 1.0 Pro C.O.R.E. for less than $400, which is about as cheap as I've seen around here. I've been really thinking about picking up a .40 as a field/woods gun that can easily transition to a carry gun - I have some .40 ammo since I have a Para Ordnance P-16, but It's not really my idea of a woods gun.
Anyway, it came home and now hosts a Holosun 507C and a Streamlight TLR-7. I may change the light as I think about how I'm going to use it, but I have a decent amount of Remington Golden Sabre, Federal HST, Winchester Ranger-T, Some Speer Gold Dot and G2, and a couple boutique ammo manufacturers, and a few hundred rounds of FMJ to make sure it runs with whatever I decide is going to be the carry load. I'll probably pick up some dedicated animal defense loads too to try.
Lastly, and after reviewing posts above... I'll be in the hunt for a .357Sig barrel... I really like that caliber!