The app is easy to navigate, I can just pick what I need from all my simulators and get back to work. Also, the price is right! No subscription like other sim folder/apps out there out there. So far I haven't found anything wrong with it. Give it a try, you will be pleasantly surprised. We use this to test our iOS mobile applications before release to clients. It's quick, easy and works well! I like that it's free, easy-to-use, and allows me to share my devices with other people who use simpholders as well! Sometimes there are updates to iOS which causes problems when sharing devices or even just opening up an app in one device while having another open in another. I would recommend this product because of how simple and useful it is! It has allowed us to easily test out our applications without needing to pay for expensive developer licenses.