I tried to get into it, but between finding recipes and washing the blender, it wasn’t less effort or money than just making a sandwich. I did not find it helpful as a diet aid, because I would still be hungry after a “meal replacement.” If I don’t have time to cook, I don’t have time to blend. If I make a bunch in advance, I can just as easily make a bunch of salads in containers.
I’m already fat and disabled, though, and I work from home, so factor that into my experience.