My favorite part about OptiSigns is that you can place the signs anywhere in your home or office and it's not visible to the general public. It also makes for easy maintenance with no need for constant attention from an installer. I wish there were a way to add more than two choices for a specific message, but other than that, everything is great! Nothing so far. We have been using OptiSigns for over 4 years now and we haven't had any problems. The only issue I've seen is that if there is too much light coming through the window, the image will be blurry. But that doesn't happen often. And the company is always willing to work with us to fix it. Even when we are out of town, they can still install our signs in short notice.