Impact may vary according to model. I've updated Gen1 models (H10, H12) and had a couple of hours on the water. This update was intended to improve depth reading performance along with a few other issues. I haven't had any depth reading problems since buying the units and believe that was more of an issue with some of the G2N models. With the last two updates, it severely impacts the sensitivity/contrast settings almost to the point that now have to use Switchfire Max mode or maximum sensitivity in deeper water. Not sure I'll stay at this rev until I have a little more time on the water. Have seen a few reports of success with G2N models in other forums. You may already know you can revert back to the prior revision if you try it and don't like it.