I use the "old" mobile version of PE most of the time, and one thing that drives me nuts is how the left and right navigation buttons are all the way on the bottom left! The left button is hard to reach with your right thumb! Why didn't they put these buttons in the middle so they're equally accessible to right- and left-handed people, and put the probably much less-used "share" button on the left? I use that button maybe once a day or two. The navigation buttons I use all the time, especially the left one.