These graphs from Mattax show how important it is to be able to log and graph AFR and RPM. It unlocks the real potential of the wide bands. The wide bands that do not have this ability are very limited. Having a passenger monitor the guage, or videoing it, or trying to watch it while pulling through the gears is barely functional. And not real safe.

Unless there is already a datalog system on the car, the only widebands that should be considered for tuning, should have logging and graphing incorporated.