I've had both versions 2 and 3 loaded for a couple of years. Frankly, I haven't seen a significant difference between them, except that for some reason I can't get version 3 to work the same way as a Photoshop action...which is why I'm still using version 2.
Portraiture works wonderfully, quickly and silently, as actions. I've got actions set up for skin selection in various skin tones as well as various levels and types of softening effects. More "modern" (read:"Now with AI included!") applications claim to work within Photoshop, and they do, but they really want to the the star of the show and actually make you interact with them as separate applications rather than giving you the ability to just apply a pre-created effect with a button press.
Topaz has particularly annoyed me in that manner.