My thoughts:
Just to set the record straight I am a new shooter and don't have a lot of experience with different brands. What I have used (others) Glock, colt 1911, both in 9mm. I decided on the M&P because I wanted plastic, and the range kit was so much value it was hard to resist. I went with the 40 because a relative shoots 10mil and he reloads for me so it was a no brainer. I have put 1000rds through this in 8 months.
Likes:
It fits, simply go to a store and pick it up, you'll see.
Auto slide release after slamming a mag in= FAST reloads.
Four mags, holster, mag pouch, mag loading tool...........$649 at small town shop........need I say more????
Oh, did I say mag loader???? FOR ONE DAY I was the envy of the range while everyone oogled my mag loader lol!!
SUPER easy to strip/clean.
Changeable back straps, three included. Not one FTF, FTE, or similar in 1000 rds.
Dislikes:
Sights, I'm blind and I just couldn't see without night sights in low(er) light conditions. Could be me though.
Trigger sucks, no other way to put it. I was going to buy a kit this last weekend, but after doing some searches came up with Browells?? spelling?? Anyway it was a pdf file put together about the M&P trigger and the steps to improve it. I can lead you there if you pm me. I'm glad I seen this because mine has updated parts already from factory. Spent about two hours on it and made some improvements (for free).
Mags that won't take 10 rds. I had to disassemble the mags and shorten all the mag springs because even if I could get the tenth round in, the slide won't remove it from the mag. Free fix, just my time. Someone that I shoot IPSC with suggested that I do it after watching me only load 9 rds. Sure enough do search and it's right there.
Empty case ejection..........shooting 40 when everyone else shoots 9 is a major PIA. This thing spits brass in no particular place making retrieval almost impossible. Once in a while empty brass will come and hit me in the top rim of my safety glasses. DO NOT shoot this whithout eye protection.
Hope it helps, cheers.