Quote Originally Posted by MattKing View Post

I think the most important thought for me on this issue is that a photographer needs to be able to choose the camera height that is most suitable for the circumstances.
I completely agree. With a waist level finder you don't have to shoot at waist level and with a prism finder you can always drop to one knee or step on a stool. You can do the job with either waist level finder or prism finder. If you own both then choose which works easier for the situation.