the 'foty was dead too me the day it hit the gun magazines and put on the market. Too me, it's fanfare was similar to that of the "as seen on TV" commercials for the remco super slicer juicer, heralded as the new wonder round that would do it all. I didn't believe the hype then, and time has proven (after Law Enforcement agencies across America have spent a ton of dough on the gimmick) that its not a marked improvement of the cartridges it was designed to replace. At the time published ballistics should have squashed it before it went mainstream in LE circles.
Less accurate than the .45 ACP or 9mm due to high pressures, a 10mm lite, designed for women and those with small hands. It promised superior performance to the 9mm or .45 ACP, but doesn't deliver enough to justify changing from either of those cartridges.
Unfortunately, there are some in the Military that look to the .40 S&W as the answer to what they think they need in a side arm. Hopefully that will never gain traction.
Now, the .357 Sig, I thought that round would really take off, but I don't think it has.
I am also one who was never smitten by the 40. The arguments about the 10mm being too much recoil for female officers/agents and the pistols chambered in 10mm having too large of a grip for female officers/agents is highly questionable. When the 40 was developed, it was placed into pistols designed as high capacity 9x19mm pistols. I have medium sized hands, when it comes to high cap sized pistols, the Hi Power and CZ-75 type pistols are quite comfortable for me, but the metal framed S&W's with arched back straps and the Beretta 92 series feel a bit oversized to me. I can't see how these would feel right for a female with smaller hands, so I find the argument of grip size to be highly questionable.
As for recoil, yes, the full power 10mm has recoil. It's ballistics easily match or slightly exceed those of the .357 Magnum and they both recoil about the same in my experience. Is this too much for a female? Depends upon the individual female and, just like the .357, ammo does not have to be full power to be effective, so I find the recoil argument to be highly questionable.
I don't have enough experience with 40 to say if it is any worse than the 9x19mm or 45 ACP in terms of accuracy, but it seems that the 9x19mm and 45 ACP are the more likely choices for precision pistol shooting.
When it comes to our military, I think they will stick with the 9x19mm so long as that is the standardized caliber for NATO. I know the MEU SOC and MARSOC units went back to the 45 ACP and in the 1911 platform quite a while ago, but even they are going back to the 9x19mm and this time it is in the Glock 19.