I've gotta side with Fastbolt here, I bought a M&P40c at the beginning of the year. It is my first polymer pistol. Personally I've never liked the ergonomics of the Glock. I've shot a friend's 27 on a number of occasions and find the M&P much easier to shoot. Recoil between the two with any given load the M&P will have less percieved recoil every time.
The extra 1/2" grip lenght doesn't make any difference to me, I carry mine in a Galco Ankle Lite. Due to the weight distribution of the little pistol it actually rides better than a M60 in an Ankle Glove even given the additional weight of the M&P. I do wish Galco would produce the Ankle Glove for the M&P, I prefer the molded leath.
The M&P was a good purchase for me, I've had 3rd gen pistols since the early '90s. I can't say that I like the M&P as much as I do the various 3rd gen guns I have, but the M&P fills a gap that none of the 3rd gen pistols could fill for me.
Cheers,
Sam