The HF G20 is an upgrade of the smaller HF M31 which I have been using for three years with great results. I have yet to test it fully but so far it has lived up to my expectations and as I expected it to work very well I am very happy with the purchase. It's slightly larger and heavier than the M31 and offers more stability when used without a tripod. Its low-light performance is excellent, and the lens hood offers protection and a more professional look. It has 2 SD card slots instead of just one, and they're placed in a more accessible location. In addition to the large screen, it also has an eyepiece, which comes in handy when the light deflects off the screen.