Getting an edge view can be of scientific value. Obtaining exact timing information with an exact location is one way to verify the calculations as well as help in determining the size of the solar layers such as the photosphere, chromosphere, and inner most corona. Having a good video, a timing source that is reliable, and a very good GPS is essential for these measurements. This may be of great interest to a few eclipse chasers. For those wanting some details see the following:
Eventually there will be a movie as well over a 1000 hi-res images were captured looking out the windows of an air craft flying through the shadow.
Views from the edge of the path are dramatic as well as potentially useful. A prolonged diamond ring. However they are quickly finished as the photosphere of the Sun brightens the sky quickly.
In my own opinion, eclipses are short enough. Go for the central part of the path where it will be longer. This helps if there are some clouds -gives them a chance to move along. And if you end up just outside of the path of totality it is not nearly as impressive as being inside. It would be a pity to just miss.