Mine just got delivered, an S1. Paid retail, for what it's worth. Elegant, minimalist, which was my primary goal. A flipper lens cap on the scope, which needs a cap anyway + a wafer thin slice of steel on the phone case. Nothing to remember or pack. Use the app, its worth the install, definitely better than the iPhone camera app for this purpose. Nice build quality. Spend some quiet time with it at home to nail down the setup. Takes a few seconds per glassing session to line the phone up. Missed my last scouting trip by a nose, looking forward to taking it out in the field.