I have fired a lot of .40 caliber 'weapons' over the years and am fairly unimpressed with it.
In my experience the only accurate .40s have been the Berettas and the Taurus clones.
Most .40s have pretty harsh muzzle blast and snappy recoil, so I stick with a .45.
My H&K USP is so innacuarate you can hardly hit the side of a barn from the inside with it. On the other hand, my buddy's .45 USP is a tack driver.
I notice the XD in .45 caliber tends to shoot better than .40 XDs as well, albeit the XD-M models are pretty good shooters.
The .40 is fairly common as a Law Enforcement duty weapon in my area and it has an HORRIBLE reputation for stopping power in real life shootings in my area. I can think of several shootings where the .40 basically had no effect from a fleeing felon who shot it out with cops and soaked up over a half a dozen .40 hollowpoints and had to be beaten into submission with ASP batons and flashlights to the guy who shot himself in the leg with the .40 and drove himself to the hospital.
On the other hand, I can tell you about numerous one shot stops with 9mm and .38 caliber weapons in the same area, like the murder victim who caught a round nose lead .38 through the lungs, stumbled into his garage, fell down, called 911 and died on the phone.
I have numerous .45s, .44s, .357s, etc... and only one .40.
The only reason I can see to even own one is to mooch ammo off your friends who shoot .40s.
I shoot with police officers who usually have plenty of .40 caliber and can score free ammo that way.
But honestly, the .45, 9mm, .38 and .44 special are a LOT more fun to shoot and more accurate to boot.
If I was gonna go out and buy a new .40 today, I would think twice, but if I still couldn't talk myself out of it, I probably would look at an FNP pistol. They look good, seem to perform okay and are not as expensive as some of the other tactical tupperware out there.
I like the CZ designs too, though.
I am not big on striker fired guns which are basically oversized Ravens.