Though the range of possible edits is extensive, I did have a few issues with the Photo Editor. When you go to a different section--say, Effects or Enhance--and apply those edits, you must remember to tap the Done button to exit out of the Photo Editor. Even if you applied effects in the previous screen, they will not appear on your images unless you tap Done.
There is no Undo/Redo function in the Photo Editor, which can be annoying if you're layering edits. Plus, if you apply an effect and later want to revert the image to the original, you'll have to re-import the image or tap Undo from the main screen until you reach the desired editing stage. That's inconvenient because you can't preview what your edited images will look like in relation to other images in the collage while working in the Photo Editor.
On the other hand, Layout offers some helpful utilities that I wasn't expecting. For instance, if you have pre-existing captions on your photos, and then go to change the caption size of a different photo in the layout, a triangular arrow points down, directing you to the font size setting in your other captions. This feature lets you visually drag and lock the text to a particular size. Or, if you select Apply to All, the app will apply one font setting to all captions in your layout. Unfortunately, there's no choice of caption colors, which feels limiting. The color options (black or white) are automatically selected, though you can choose whether your caption has a background or not. It's a small request, but I'd also like the ability to place text anywhere on the layout and to add a title to my collages.
If you plan to print your collage--even if you're not using Layout for your year-end holiday greeting card--be sure to enable the larger project size. Layout's largest output is 2048 x 2048 pixels (or 4 megapixels), so you'll need that higher resolution for print-quality photos.
Whatever size you choose, you can print your layout directly from the app, email it, or export it to Camera Roll, Facebook, Twitter, or Flickr.