Anyone use this system? Our Adv B&W class requires us to use this, it's been 3 weeks and it just isn't clicking.
The Zone System is actually rather simple, at least at its heart. It is merely a carefully controlled and calibrated variant of the ancient common widsom, "expose for the shadows and develop for the highlights".
What it adds to that old rule is adjusting the film's tonal range by modifying development so that a particular scene's range from shadow to highlight fits the tonal range of the film. Complete application of the Zone System does require that each shot be developed differently. This is most practical with large format sheet film.
For many users of small format cameras that shoot rolls of film such custom development of each shot is not practical. These users generally calibrate they film and its processing in a "one size fits all" way. They still use the Zone System rules for determining the optimum exposure for a given shot, but they live with the one tonal range (number of usable Zones) that their one film/development combination produces.
For the bulk of my old B&W film days I used this limited sub-set of the Zone System (roughly a 20 year period). I did shoot a little large format and used image specific development modification. The basic concepts also apply to color film, though without the development adjustments, and digital.