I go along with Trader Gary - I have HDR+ on all the time. At very worst (a scene with a small dynamic range) it does nothing. At best, with bright highlights and deep shadows, it greatly improves the picture. Depending on the phone and the camera app, it may take longer than you like to process, so experiment first. Take a picture in a fairly dark room, with some really, really dark shadows (like under a table), with some really bright light (like the sky showing through a window), and see botgh the difference with HDR+ on and off, and how long it takes after you shot the picture with HDR+ on. (This is for non-Pixel owners who might be reading this - because there are HDR+ camera apps available for all Android phones. The Px2 line processes HDR+ pretty fast.)