I've got extensive time with my wife's gun.
Of note:
The polymer doesn't feel any "cheaper" than any other plastic. I'm not even sure what that means or how to judge it though.
The thumb safety on my wife's gun is very positive and I have no issues hitting it instictually. Even if as a general rule I don't like thumb safeties on anything that isn't pure single action.
It's thinner in the hand and carrying than the specs will tell you. It feels alot thinner than the Glocks, M&P's, and other double stacks. For me, it feels like a pretty big difference. Very easy to carry.
My opinion is that it's as good a firearm as any. It's accurate and reliable, manufactured by a classic and reputable American company. An excellent value.
For me, it's a little smaller than I like for a gun. If they would have just made it a little bigger, G19(ish) it would have been an excellent option for my money. As is, the wife loves hers and I would recommend it.