Yes, for several reasons.
Due to the huge variety of lens and camera specifications offered by smartphones, I had to find a distance from the film plane that works for most phones without cropping any of the image area. Some phones with wider lenses will see more black around the edges than others.
Users have told us that they like the ragged edge look of "overscan" images. Film photographers often scan their images to show the edge of the negative, showing the sprocket holes or film markings. This is a way of showing that the photograph is more analog in nature. Proof that its more than just a digital snapshot with a filter slapped on it. So I encourage people to share their images with a little black around the edges. If you would rather have a clean edge look, doing an image crop on your work is only a small extra step.
The rough black edges (while unique to each smartphone/camera combination) should be consistent enough that the crop can be batch applied, or setup as an import automation in professional photo editing apps like Lightroom.
What about video?
Most smartphones crop the image sensor when shooting video, so in some cases you will not need to crop your video footage in post. The final image area will vary depending on your phone's camera specifications.
Why are the borders off-center?
We are aware that some users experience more significant alignment issues than others. In our testing even identical models of smartphone have minute variations in the left/right/up/down alignment of the lenses and sensors in their camera systems. The impact this microscopic variation can have to the position of the image on the focusing screen can be significant.
If you are particularly unhappy with the alignment your phone and camera combination produces right out of the box, first, make sure the retaining screw of the twist-lock cradle is tightened all the way. If the image is still out of alignment (or if this step makes it worse) unscrew the twist-lock and add small shims of folded paper or cardboard in the gap between the cradle and the body until the alignment is corrected.