S&W polymer-framed pistols?
I generally don't get emotionally attached to firearms. Granted, I enjoy owning some more than others, but over the years of my LE career my interest has become mostly focused on their practical value and attributes when carried as defensive weapons on & off-duty.
As a firearms instructor and armorer I've been fortunate in the regard that I've had a fair opportunity to become familiar with a number of the handguns used in the LE field. I've also been able to attend a number of armorer classes over the years (more than Baker's Dozen
).
I've attended armorer classes for the Sigma, Glock, SW99/P99 & the M&P (7 classes altogether for those models).
I own a couple of Glocks.
I own a couple of SW99's. I also carried a SW99 (.40 S&W) as an issued weapon for a few years and helped support and maintain about 50 of them over the last several years.
I own a M&P 45.
I never particularly cared for the Sigma trigger, although I've always thought the grip angle and ergonomics were very good. There have been a number of changes, revisions and refinements in the Sigma line since I attended the armorer class. I was told that the Sigma line benefited from some further refinement within the last few years, and its actually one their strongest selling lines (despite its often vocal detractors among internet forums). I have little doubt the budget cost helps its attractiveness.
While I like many things about the 99 series line, I think the M&P design offers some noticeable advantages among its features in many respects. I've mentioned this in other threads.
One of the things I've noticed over the years is that Walther is sometimes seemingly slow to ship parts here for the 99 series. Not all that uncommon to be told that parts are back-ordered from Walther.
I won't be getting rid of my Glocks, SW99's or my M&P 45 ... although I could see "retiring" my standard size SW99 (.40 S&W) and G27 to the back of the safe and eventually replacing them with similarly sized standard & compact M&P pistols chambered in .40 S&W.
FWIW, S&W has been doing very well with the new M&P pistol series. Although it was only released in January 2006, S&W has won contracts in slightly over 80% of the LE pistol evaluations/bids when the M&P was considered among the candidate pistols. Over 330 agencies so far, last I heard. Not bad for a new pistol design on the market for just a couple of years. Granted, its received some minor revisions and refinements since its initial release ... but Glock continues to make upgrades, revisions and refinements to its model line, too, you know.
I think S&W will do well with the M&P line.
I'll always have a personal preference for a nicely done traditional double action trigger design (DA/SA, if you prefer) for common defensive pistols, but I became accustomed to the Glock, and I've quickly learned to become accustomed to the M&P trigger, as well.