My opinion is, "Finally"!
The only negative thing I can say right now is that S&W is missing one of the biggest 10mm pistol markets, that being the hunting market.
Many state laws require a barrel length of 5" or greater to be legal for hunting certain animals, which is exactly why many folks would buy a 10mm in the first place. Why in the world would S&W only create a 4" and 4.6" model, but completely omit the 5" model for hunters?