PhotoPanel: Photo Frame

It automatically pulls new photos from any album, including shared iCloud albums. The customization is perfect: you can set different durations for portrait vs landscape, add a subtle clock, and even hide the status bar for a true screensaver feel. Works great with orientation lock off too. Incredible value, worth every cent.

This is probably the only app in the appstore right now that gets the slideshow function down and no recurring subscription fees. I use this to display hundreds of picture in a slideshow on my iPad. Duration of each picture and type of transition is intuitive and easy to configure. No bloat. No more manually choosing all the pictures in my album. It comes with some extra features like displaying clock and time/date of when the picture was captured.