I have a couple of .40 S&W'S, all are BERETTA or BERETTA clones (STOEGER). I carried a .40 S&W, on duty for over 20 years till my agency swapped out my H&K P2000 (no loss there) for a GLOCK 19 (much better). Before that, I was issued a BERETTA 96D Brigadier and liked it as a duty gun, but hated carrying it off duty because it was so large.
I still have a BERETTA 96D Brigadier, that I personally purchased through our agency and it shot very accurately the last time I shot it.
After that, I bought a GLOCK 22, figuring it would be lighter and easier to carry off duty. However, I found the recoil unpleasant and my recovery time between shots was too long. This had not been a problem with the heavier BERETTA. so I stuck with the model 96 until the BERETTA 8040 came along and was followed by the STOEGER 8040, which is the same gun, but made in TURKEY, instead of ITALY.
Mostly, I have been shooting the STOEGER 8040 Cougar. When the rush back to 9m.m. started with the FBI switch, the already cheap .40 caliber Cougars, got just too cheap to pass up. I had a police trade in BERETTA 8000 Cougar in 9m.m. and liked the grip and trigger on the Cougar, so I bought two 8040's for the price of a BERETTA 96.
They both are 100 % reliable and easy to shoot. They are also much easier to carry than the larger BERETTA 96. I had a 96G and 96 Centurion and I sold them both. They were just too large and the model 96 was never up to regular use of the high velocity .40 caliber ammo.
We were originally issued 155 grain jhp ammo that left out 96D Brigadiers at about 1200 feet per second. They hit hard, but wore out our BERETTA'S within 10 to 12 years of issue. Soon after switching to the H&K, we started using the 135 grain jhp at the same velocity. Finally, we went to the mild 180 jhp, but used FEDERAL HST ammo, which really performs well in the 180 grain weight.
I use the generic, white box 180 grain ammo in my .40 S&W pistols for the range and the same FEDERAL 180 grain HST load for house and carry.
Oh, last year, when I got the second STOEGER 8040, I tried some of my old 155 grain ammo side by side with the 180 grain ammo. It was like mixing .38 +P and .357 magnum ammo. The 155 grain ammo was much louder and had a brighter flash, as well as sharper recoil. It was like the .357 ammo we used to carry before we went to the .40 S&W.
Overall, I think the .40 S&W is a very good round, but it is more dependent on the which gun you select than the 9m.m. and your recoil tolerance. It just does not offer a BIG improvement over the best 9m.m. ammo, in my opinion.
Jim