Since I needed to attach my camera to microscopes and telescopes, a waist level finder has been an important feature for me for a long time. My very first SLR (Miranda Sensorex) had a waist level finder. I also had a waist level finder for my Nikon F, F2, F3, and F4.

Nikon really disappointed me when it failed to equip the F6 and its digital SLRs with this useful feature.