<p>I've used the vertical grips on all my cameras going back to my Minolta 600 si's to my 800's, my max 9, KM 7D, Sony a700, a900 and finally my SLT a99. I've always found that the grips provide a better balance with heavy lenses but they also expand battery length of of use. I don't think I would ever be comfortable to use any of those without the grip in place. The one thing that to consider is that they do add more weight to the camera but I have kind of gotten used to it over the years.</p>