When you open the app, your photos are grouped in sets that make no sense. You have to go through a few of them to find what you need. It should just mimic the iOS photo sets.
Once you have resized, there is no clear way to tell if it worked because it doesnt display actual photo sizes when you select a photo.
When you preview a photo, it is inexplicably tiny.
There is no way to tell if thumbs have landscape or portrait orientation, so you have to preview each before resizing.
DTrak23 about Reduce - Batch Resize Images and Photos for iPhone & iPad