The app lags all the time: new photos after taking them may appear after half a minute, photo details (size, location, etc) may not load ever, deleting a photo requires you to wait 20 seconds with redundant intermediate dialogs. But the main concern is it heavily drains battery: 35+% of a charge is taken only by photos, spending hours in background to upload several dozens of pictures on fast wi-fi. And there's no option to upload only while charging.