I was talking about the Picture Pile Collage option which keeps the image as is, but allows you yo place and resize images as you wish. The other collage options sometimes crop the images and as far as I know, you are not able to alter how the images have been cropped. You can move them around, but that's of little use if the picture's been cropped the wrong way.
The Picture Pile lets you set up how you want with just a little bit more work. Still way faster than doing the same thing with Photoshop imho.