SO SO SO MUCH BETTER THAN BEHOLDER EC-1. I am very satisfied with this product. It aligns my camera perfectly every time, it's smooth and easy to use. The only reason I didn't give it five stars is that the app doesn't work very well, switching between modes is a bit confusing (compared to Observer), no way to check battery life, no "on Send source" function. Position' as a viewer which was handy and just seems lacking in explanation of the main issues I think users will have and I think that's because it's an Asian product and obviously some of those detailed information is lost in translation.