A few weeks ago I got my first .40, a Smith 410. Couldn't pass it up -- $300 and change OTD, and it's in very lightly used shape.
Still haven't found time to shoot it. I've shot other .40s -- HK, Glock, a High Power (that was subsequently recalled because of a very bad tendency for some of the first ones to, well, explode), an early HK UPS, and a few shots out of an HK P7M10. They didn't make many of those, and they were not particularly pleasant to fire.
I've never been all that enamored with the concept of the .40, and probably still wouldn't have one were it not for the good price on the Smith I found, but I don't discount its effectiveness or power.
I did have for a number of years a 10mm CZ, but I ended up selling it to a friend. I just wasn't all that hep on it, either.