Nik Collection 9 is more than another preset update. AI Masks and Depth Masks make local work faster, while the new Color Grading tool gives Nik Color Efex a more deliberate route to shaping mood across shadows, midtones and highlights.
The suite still feels recognisably Nik: fast previews, expressive filters and U Point local adjustments. What version 9 changes is how easily those effects can be targeted, combined and refined. That makes the collection feel more like a finishing environment and less like a box of separate effects.
My advice is to use the free trial on a small group of images you know well. Test a portrait, landscape and monochrome conversion. You will learn far more from that than cycling through every preset in the suite.