If you're looking for a match to the Shield, here is the criteria my research has produced:
1 - Must be capable of excellent accuracy.
2 - Excellent trigger
3 - Must drop the magazine during course of fire
4 - Must be easily removed from battery, while not easily returning to battery.
5 - After a few shooting sessions, the rear of the slide should appear to be damaged.
6 - Drift pin, forerward of the trigger, should begin to walk out at about 100 rounds.
7 - Ability to be acquired at retail should be extremely limited.
Anyway, that's what I've been able to gather thus far. My guess is that production was slowed, or even suspended, while S&W fixed issues related to a gun that was rushed to market (as many pruducts are). However, the Shield isn't a new DVD player. It's redesigned product that one uses to protect their life and the lives of their families. I'm not thrilled. I'm happily waiting for a post 2012 version of the Shield, as I believe I can bypass these issues. I tell you this, after almost exclusively buying used guns for over 20 years, I will never buy a used Shield.
The Walther P series does seem tempting for my Mrs as well though. So, we'll see.