I just received the camera yesterday and took some sample shots last night. The IS feature is excellent (see EXIF for shutter speed). Zoom feature is much faster than the Pro 90 IS. Flash is powerful. It uses four AA batteries which is a big plus from BP-511 and much cheaper. Electronic viewfinder is also improved quite a bit from Pro 90. Body is much more compact. It such a big improvement overall in three-year time... Canon continues to deliver.