Well I took my new M&P forty to the range today and was really impressed. I shot a hundred rounds of Blazer brass 180gr. and 4 mags of Winchester Ranger 180gr. The pistol shot really great, but as expected from a compact it does have a little bite. I did not have any problems with mags falling out, or any of that stuff. I had one stoppage with the Blazer ammo, but this happened when shooting one-handed and probably my fault. The trigger of this pistol was a concern of mine at first, but felt was ok when shooting. I don't think the reset is a short as my Glocks, but maybe I am just more use to them.
I also took a couple of my Glock buddies as comparison. I brought my G23 since it is the only .40 that I have to compare to. I then shot several mags of the Bazer brass. Well the M&P felt like it had a little more perceived recoil, but the grip is more comfortable, resulting in a little better grouping than the Glock. Neither pistol is what I would consider to be a fun gun to shoot more than a hundred rounds, or so, at a time. Next I shot my G26 and it is a real pussycat to shoot compared to the M&P .40. I shot 150 rounds of blazer 115gr. and could have shot several hundred more. I bet the M&P 9mm would be a joy to shoot also.
All in all, the M&P is a really nice pistol that I should be happy with. Only time and many more rounds will tell.