The M&P357c has been my CCW for about a year. I also have compact and full-size versions of the same gun chambered in 40S&W. It definitely does have a "snappy" feel but it is, also definitely, not "too much for a light pistol".
My wife and I periodically shoot close-quarters combat drills with a small group of guys and, after sessions where she uses the gun, she will complain of a sore wrist; but 150 rounds in three hours is a lot of shooting and, ultimately, she's as competent with the .357Sig as with any other weapon she uses.
We're both happy with having made the purchase.
I hope this helps.